ORCID Profile
0000-0003-1926-9862
Current Organisation
University of Wollongong
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Organic Chemical Synthesis | Physical Chemistry (Incl. Structural) | Structural Chemistry and Spectroscopy | Organic Chemistry | Functional Materials | Physical Chemistry of Materials | Physical Chemistry not elsewhere classified | Macromolecular and Materials Chemistry | Chemical Sciences not elsewhere classified | Photodetectors, Optical Sensors and Solar Cells | Proteins and Peptides | Electrochemistry
Solar-Photovoltaic Energy | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Hydrogen Production from Renewable Energy | Energy not elsewhere classified |
Publisher: International Union of Crystallography (IUCr)
Date: 25-07-2007
Publisher: Wiley
Date: 18-01-2011
Publisher: American Chemical Society (ACS)
Date: 19-03-2020
Publisher: Elsevier BV
Date: 09-2007
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/CH10413
Abstract: Neat liquid 3-alkoxy-2-bromothiophenes such as 2-bromo-EDOT have been shown to autopolymerize at room temperature and above, depending on their proton acidity and the nature and arrangement of substituents.
Publisher: American Chemical Society (ACS)
Date: 24-09-2015
Abstract: Electron lifetimes in dye-sensitized solar cells employing a porphyrin dye, an organic dye, a 1:1 mixture of the two dyes, and a dichromophoric dye design consisting of the two dyes using a nonconjugated linker were measured, suggesting that the dispersion force of the organic dyes has a significant detrimental effect on the electron lifetime and that the dichromophoric design can be utilized to control the effect of the dispersion force.
Publisher: World Scientific Pub Co Pte Lt
Date: 12-2016
DOI: 10.1142/S1088424616501285
Abstract: Thin films of vapor-phase polymerized PEDOT incorporating various cationic Mn porphyrins were assessed for water oxidation catalysis under light illumination. Only Mn(III)TPP/PEDOT displayed a notable photocurrent and this was, counter-intuitively, greatest at the lowest loading levels examined. Studies revealed that a proportion of the Mn(III)TPP within the PEDOT became demetalated during polymerization, leaving free and protonated TPP. Despite the presence of an excess of chemical oxidant during the polymerization step, the Mn(III) ion was reduced — likely under the influence of light — to Mn(II), which was labilized out of the film. Whereas PEDOT films loaded with anionic Mn porphyrins may be active and selective water oxidation photocatalysts, their analogs containing cationic Mn porphyrins, like Mn(III)TPP, are catalytically inert.
Publisher: American Chemical Society (ACS)
Date: 09-10-2009
DOI: 10.1021/JA9057713
Abstract: Zn-Zn porphyrin dimers have been incorporated into thin dye-sensitized solar cells (DSSCs) to boost their light harvesting efficiency. The photoexcited dimers show efficient and fast electron injection into TiO(2) indicating that both photoexcited chromophores contribute to current generation. The improved light harvesting ability coupled to enhanced DSSC performance demonstrates the potential of 3-D light harvesting arrays as next generation light harvesters for artificial solar energy conversion systems.
Publisher: International Union of Crystallography (IUCr)
Date: 15-06-1996
Publisher: American Chemical Society (ACS)
Date: 27-10-2023
Publisher: Wiley
Date: 18-09-2014
Abstract: The controlled movement of a chemical container by the light-activated expulsion of a chemical fuel, named here "photo-chemopropulsion", is an exciting new development in the array of mechanisms employed for controlling the movement of microvehicles, herein represented by lipid-based microdroplets. This "chemopropulsion" effect can be switched on and off, and is fully reversible.
Publisher: American Chemical Society (ACS)
Date: 19-07-2007
DOI: 10.1021/JP0750598
Publisher: American Chemical Society (ACS)
Date: 18-10-2011
DOI: 10.1021/JP2093109
Publisher: American Chemical Society (ACS)
Date: 12-04-2023
Publisher: International Union of Crystallography (IUCr)
Date: 31-01-2003
DOI: 10.1107/S0108270103001161
Abstract: In the title compound, C(8)H(8)N(2)OS, strong intramolecular N-H.O hydrogen bonds [N.O = 2.669 (3) and 2.618 (3) A] form almost planar six-membered rings and enforce the conformation of the molecule. Two kinds of intermolecular N-H.S hydrogen bonds [N.S = 3.309 (3)-3.456 (2) A] between two symmetry-independent molecules form consecutive dimers that expand in ribbons along the [100] direction.
Publisher: Elsevier BV
Date: 11-2002
Publisher: MDPI AG
Date: 13-04-2022
DOI: 10.3390/INORGANICS10040053
Abstract: Electrocatalysts are capable of transforming water into hydrogen, oxygen, and therefore into energy, in an environmentally friendly and sustainable manner. However, the limitations in the research of high performance catalysts act as an obstructer in the development of using water as green energy. Here, we report on a delicate method to prepare novel bimetallic metal organic framework derived electrocatalysts (C–NiCu–BDC–GO–CC) using graphene oxide (GO) modified carbon cloth as a 3D flexible and conductive substrate. The resultant electrocatalyst, C–NiCu–BDC–GO–CC, exhibited very low electron transfer resistance, which benefited from its extremely thin 3D sponge-like morphology. Furthermore, it showed excellent oxygen evolution reaction (OER) activity, achieving 10 mA/cm2 at a low overpotential of 390 mV in 1 M KOH electrolyte with a remarkable durability of 10 h.
Publisher: Elsevier BV
Date: 09-2005
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CC05451H
Abstract: The first ex le of ‘one-pot’ coordinate-covalent synthetic programming for metal–organic frameworks is reported.
Publisher: LUKASIEWICZ Research Network - Industrial Chemistry Research Institute
Date: 03-2009
Publisher: MDPI AG
Date: 22-08-2021
Abstract: A study was carried out on the possibility of orderly and spontaneous dimerization at room temperature of C60 cages in fullerene liquid crystal fullerene dyads (R-C60). For this purpose, dyads with a structural elements feature supporting π-stacking and Van der Waals interactions were tested, due to the presence of terthiophene donors linked through an α-position or dodecyloxy chains. In addition, this possibility was also tested and compared to dyads with shorter substituents and the pristine C60. Research has shown that only in dyads with the features of liquid crystals, π-dimerization of C60 units occurs, which was verified by electrochemical and spectroelectrochemical (ESR) measurements. Cyclic voltammetry and differential voltammetry studies reveal π-dimerization in liquid crystal dyad solution even without the possibility of previous polymerization (cathodic or anodic) under conditions in the absence of irradiation and without the availability of reaction initiators, and even with the use of preliminary homogenization. These dyads undergo six sequential, one-electron reductions of π-dimer (R-C60···C60-R), where two electrons are added successively to each of the two fullerene cages and first form two radical anion system (R-C60)•−(R-C60)•− without pairing with the characteristics of two doublets. Similarly, the second reductions of π-dimer occur at potentials that are close to the reduction potential for the conversion to a system of two triplet dianions (R-C60)2−(R-C60)2−. Electron paramagnetic resonance spectra indicate a significant interaction between C60 cages. Interestingly, the strength of intermolecular bonds is so significant that it can overcome Coulombic repulsion, even with such highly charged particles as dianions and trianions. Such behavior has been revealed and studied so far only in covalently bonded C60 dimers.
Publisher: Elsevier BV
Date: 09-2005
Publisher: Elsevier BV
Date: 12-2018
Publisher: American Chemical Society (ACS)
Date: 13-06-2023
Publisher: American Chemical Society (ACS)
Date: 30-05-2013
DOI: 10.1021/JP3067712
Publisher: American Chemical Society (ACS)
Date: 08-06-2020
Publisher: American Chemical Society (ACS)
Date: 27-09-2018
DOI: 10.1021/JACS.8B09070
Abstract: The strategies to enhance electron transfer rates between redox-active, light-harvesting molecules attached to semiconductor surfaces and redox mediators in solution by modifying molecular structure are not fully investigated yet. Therefore, the design of molecules with controlled electron transfer rates remains a challenge. The aims of this work are to quantify the effect of long alkyl chain substitution on the electron transfer from cobalt(II/III) tris(2,2'-bipyridine) to organic molecules containing carbazole and thiophene and to demonstrate that alkyl chains can be used to enhance electron transfer between donor-acceptor pairs. To this end, we study the effect of using a combination of donor and acceptor molecules with and without alkyl chains on electron transfer kinetics. Using transient absorption spectroscopy, we show that when only the molecules or the mediators have long alkyl chains, electron transfer is slightly blocked as expected. Counterintuitively, electron transfer is up to 13 times faster when long alkyl chains are attached to both the redox-active molecules and the redox mediators. The faster electron transfer is explained by an alkyl-alkyl chain interaction between the donor/acceptor, leading to the proximity (trapping) of the redox mediators close to the π-conjugated backbone of the molecules. These results suggest that intermolecular interactions can be used to enhance the electron transfer rates significantly even with well-established insulating alkyl chains attached to molecules without changing the electrochemical driving force.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA03226H
Abstract: Non-conjugated di-chromophoric zinc porphyrin dyads showed simultaneously improved V OC and J SC compared to the single zinc porphyrin.
Publisher: MDPI AG
Date: 14-12-2019
DOI: 10.3390/JCS3040108
Abstract: Light-driven water-splitting to generate hydrogen and oxygen from water is typically carried out in an electrochemical cell with an external voltage greater than 1.23 V applied between the electrodes. In this work, we examined the use of a concentration/chemical bias as a means of facilitating water-splitting under light illumination without the need for such an externally applied voltage. Such a concentration bias was created by employing a pH differential in the liquid electrolytes within the O2-generating anode half-cell and the H2-generating cathode half-cell. A novel, stretchable, highly ion-conductive polyacrylamide CsCl hydrogel was developed to connect the two half-cells. The key feature of the cell was the half-cell electrodes, which comprised thin-film conducting polymer composites that were previously designed to maximize light-driven catalysis at moderate pH. Upon being connected with the hydrogel in the presence of light irradiation (0.25 sun intensity on each electrode), the half-cells spontaneously produced hydrogen and oxygen from water, without the need for an externally applied voltage bias greater than 1.23 V. The cell operated reliably and efficiently for 14 h of continuous testing. These results demonstrate the fundamental feasibility of light-driven water-splitting in a photoelectrochemical concentration cell when employing electrodes that operate efficiently at moderate pH, even with low levels of light illumination. The designed conducting polymer composites proved ideal in that regard.
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B805027A
Abstract: Electron lifetime and diffusion coefficient measurements in highly efficient porphyrin-sensitised TiO(2) solar cells showed reduced electron lifetime, and consequently, lower photo-induced electron density under illumination compared to commonly used ruthenium dye (N719)-sensitised solar cells, which is proposed to be the origin of the generally lower open circuit voltage.
Publisher: International Union of Crystallography (IUCr)
Date: 10-08-2002
Publisher: AIP Publishing
Date: 16-11-2021
DOI: 10.1063/5.0072034
Abstract: To date, a number of photon up-conversion (UC) systems with high quantum efficiencies have been demonstrated, including at non-concentrated solar illumination intensities. These are, however, yet to be successfully combined with photovoltaic devices in order to provide substantial increases in photocurrent, as compared with devices without UC. In the present work, we perform simple calculations, based on the optical properties of an UC + solar cell system, specifically a dye-sensitized solar cell and sensitized-triplet-triplet annihilation based UC system, in line with our previous experimentally realized proof-of-concept devices. This model is then used to more specifically identify the limitations and losses, thereby providing a pathway toward improvements, based on either real or hypothetical materials. This model highlights that only a fraction of the benefit may be realized without substantial improvements being made in terms of various transmission losses, coupled with the fact that UC emission typically scales quadratically in this flux regime. The model presented can help identify where research efforts should be focused as well as where there may be little utility, with these lessons also being valuable in the future as even more efficient UC systems are developed. Furthermore, a spreadsheet is provided in the supplementary material to assist other researchers in their efforts.
Publisher: American Chemical Society (ACS)
Date: 07-07-2021
Publisher: Wiley
Date: 19-02-2022
Abstract: Reactive extrusion printing (REP) is demonstrated as an approach to simultaneously crystallize and deposit films of the metal–organic framework (MOF) Cu 3 btc 2 (btc=1,3,5‐benzenetricarboxylate), also known as HKUST‐1. The technique co‐delivers inks of the copper(II) acetate and H 3 btc starting materials directly on‐surface and on‐location for rapid nucleation into films at room temperature. The films were analyzed using PXRD, profilometry, SEM and thermal analysis techniques and confirmed high‐quality Cu 3 btc 2 films are produced in low‐dispersity interconnected nanoparticulate form. The porosity was examined using gas adsorption which showed REP gives Cu 3 btc 2 films with open interconnected pore structures, demonstrating the method bestows features that traditional synthesis does not. REP is a technique that opens the field to time‐efficient large‐scale fabrication of MOF interfaces and should find use in a wide variety of coating application settings.
Publisher: Elsevier BV
Date: 09-2008
Publisher: Wiley
Date: 09-08-2018
Publisher: Wiley
Date: 31-05-2006
Abstract: The Raman spectra of various terthiophene radical cations are investigated namely those of unsubstituted terthiophene and two styryl-substituted terthiophenes. Transient pump-probe resonance Raman spectroscopy is used to measure the short-lived radical cation spectra of non-end-capped 2,2':5',2''-terthiophene (3T) and 3'-[(E)-2-(4-nitrophenyl)ethenyl]-2,2':5',2''-terthiophene (NO2-pe3T). For these two compounds, the radical cations are generated via either direct photogeneration or photochemically using the electron acceptor tetracyanoethylene. The radical cation of 5,5''-dimethyl-3'-[(E)-2-phenylethenyl]-2,2':5',2''-terthiophene (DM-pe3T) is stable for up to five minutes as a result of the two alpha end caps and continuous-wave resonance Raman spectroscopy and chemical oxidation is used to obtain the spectrum of this radical cation. The resonance Raman spectra of all three terthiophene radical cations are dominated by a group of very intense bands in the low-frequency region. These bands have been assigned, by density functional theory methods, to C-S stretching modes coupled to thiophene ring deformations. These modes are significantly less intense in the sigma-dimer of NO2-pe3T [i.e. the corresponding styryl sexithiophene (NO2-pe3T)2]. This observation is attributed to a smaller change in the C--S bond order in the sexithiophene compared to the analogous terthiophene. This bond order difference may be rationalised by consideration of the singly occupied molecular orbital and lowest unoccupied molecular orbital, which are involved in the electronic transition probed by the laser excitation wavelength.
Publisher: Elsevier BV
Date: 03-2006
Publisher: American Vacuum Society
Date: 03-2020
DOI: 10.1116/1.5143141
Abstract: This work examines the antifouling effect of quaternary ammonium silane (QAS) grafted from coatings of silica nanoparticles (SiNPs), independently and in combination with a zwitterionic sulfobetaine (SB) silane. The binding of QAS to the SiNP coatings was monitored using quartz crystal microgravimetry with dissipation monitoring (QCM-D) under varied pH and solution concentrations. Adsorption of bovine serum albumin protein was reduced on QAS modified SiNP coatings prepared under alkaline conditions due to the proposed generation of a pseudozwitterionic interface, where the underlying SiNP surface presents an anionic charge at high pH. Significant reductions in protein binding were achieved at low functionalization concentrations and short modification times. Additionally, SiNP coatings modified with a combination of QAS and SB chemistries were investigated. Surface modifications were performed sequentially, varying silane concentration and order of addition, and monitored using QCM-D. Dual-functionalized surfaces presented enhanced resistance to protein adsorption compared to QAS or SB modified surfaces alone, even at low functionalization concentrations. The antiadhesive and antibacterial properties of functionalized surfaces were investigated by challenging the surfaces against the bacterium Escherichia coli. All dual-functionalized coatings showed equal or reduced bacterial adhesion compared to QAS and SB functionalizations alone, while coatings functionalized with high concentrations of combined chemistries reduced the adhesion of bacteria by up to 95% compared to control SiNP surfaces.
Publisher: Wiley
Date: 08-07-2018
Abstract: The emulation of the complex cellular and bacterial vesicles used to transport materials through fluids has the potential to add revolutionary capabilities to fluidic platforms. Although a number of artificial motile vesicles or microdroplets have been demonstrated previously, control over their movement in liquid in 3D has not been achieved. Here it is shown that by adding a chemical "fuel," a photoactive material, to the droplet, it can be moved in any direction (3D) in water using simple light sources without the need for additives in the water. The droplets can be made up of a range of solvents and move with speeds as high as 10.4 mm s
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6SC00429F
Abstract: Dye regeneration kinetics is enhanced by five times in a di-chromophoric porphyrin dye by attaching tridimensionally enlarged electron donor moieties.
Publisher: AIP Publishing
Date: 2020
DOI: 10.1063/1.5126467
Abstract: Materials with protein resistant properties are increasingly sought after for their potential application as low-fouling surface coatings. Hydrophilic coatings with improved resistance to protein fouling have been prepared from zwitterionic carboxybetaine (CB) functionalized silica nanoparticles (SiNPs). The authors report three methods of coating preparation via direct tethering of CB to predeposited particle films, a two-step surface functionalization process, and deposition of CB functionalized particle dispersions. The pH at which aqueous CB solutions were prepared and reacted to SiNPs was found to drastically influence the mechanism of CB attachment and affect the protein resistance of the resultant coatings. Depending on the method of coating preparation, protein binding to functionalized particle coatings was reduced by up to 94% compared to unfunctionalized SiNP control surfaces. As a result, all three methods offer simple and scalable fabrication routes for the generation of hydrophilic, zwitterionic interfaces with improved inhibition to protein fouling.
Publisher: Springer Science and Business Media LLC
Date: 24-08-2012
Publisher: LUKASIEWICZ Research Network - Industrial Chemistry Research Institute
Date: 02-2008
Publisher: Elsevier BV
Date: 09-2013
Publisher: American Chemical Society (ACS)
Date: 11-06-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1CP05798G
Abstract: Enhanced electronic coupling is achieved by opening up appropriate free spaces near the π-conjugated backbone of organic dyes enhancing electron transfer rates by six times.
Publisher: International Union of Crystallography (IUCr)
Date: 24-11-2006
Publisher: Wiley
Date: 02-11-2020
Publisher: MDPI AG
Date: 03-07-2023
DOI: 10.3390/MOLECULES28135179
Abstract: Cu2+/1+ complexes facilitate the reduction of CO2 to valuable chemicals. The catalytic conversion likely involves the binding of CO2 and/or reduction intermediates to Cu2+/1+, which in turn could be influenced by the electron density on the Cu2+/1+ ion. Herein we investigated whether modulating the redox potential of Cu2+/1+ complexes by changing their ligand structures influenced their CO2 reduction performance significantly. We synthesised new heteroleptic Cu2/1+ complexes, and for the first time, studied a (Cu-bis(8-quinolinolato) complex, covering a Cu2+/1+ redox potential range of 1.3 V. We have found that the redox potential influenced the Faradaic efficiency of CO2 reduction to CO. However, no correlation between the redox potential and the Faradaic efficiency for methane was found. The lack of correlation could be attributed to the presence of a Cu-complex-derived catalyst deposited on the electrodes leading to a heterogeneous catalytic mechanism, which is controlled by the structure of the in situ deposited catalyst and not the redox potential of the pre-cursor Cu2+/1+ complexes.
Publisher: American Chemical Society (ACS)
Date: 16-07-2018
Publisher: American Chemical Society (ACS)
Date: 23-08-2022
Abstract: The geometric and spectroscopic properties of four cationic
Publisher: American Chemical Society (ACS)
Date: 28-12-2022
Publisher: American Chemical Society (ACS)
Date: 02-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM10259A
Publisher: American Chemical Society (ACS)
Date: 22-12-2021
DOI: 10.1021/JACS.0C12050
Publisher: Elsevier BV
Date: 07-2020
Publisher: CSIRO Publishing
Date: 2012
DOI: 10.1071/CH12048
Abstract: This article reviews some of the recent work by fellows and associates of the Australian Research Council Centre of Excellence for Electromaterials Science (ACES) at Monash University and the University of Wollongong, as well as their collaborators, in the field of water oxidation and reduction catalysts. This work is focussed on the production of hydrogen for a hydrogen-based energy technology. Topics include: (1) the role and apparent relevance of the cubane-like structure of the Photosystem II Water Oxidation Complex (PSII-WOC) in non-biological homogeneous and heterogeneous water oxidation catalysts, (2) light-activated conducting polymer catalysts for both water oxidation and reduction, and (3) porphyrin-based light harvesters and catalysts.
Publisher: American Chemical Society (ACS)
Date: 17-09-2015
Publisher: American Chemical Society (ACS)
Date: 19-04-2018
Abstract: Porphyrins have characteristic optical properties which give them the potential to be used in a range of applications. In this study, a series of β-indandione modified zinc porphyrins, systematically changed in terms of linker length and substituent, resulted in absorption spectra that are dramatically different than that observed for the parent zinc porphyrin (ZnTXP, 5,10,15,20-tetrakis(3,5-dimethylphenyl)porphyrinato zinc(II)). These changes include strong absorptions at 420, 541, and 681 nm (110.2, 57.5, and 29.2 mM
Publisher: Wiley
Date: 2005
DOI: 10.1002/JRS.1327
Publisher: International Union of Crystallography (IUCr)
Date: 08-03-2006
DOI: 10.1107/S1600536806007033
Abstract: The molecules of the title compound, C 5 H 5 N 3 O 4 , are approximately planar. The nitro group makes a dihedral angle of 1.3 (4)° with the plane of the six-membered ring. This coplanar disposition is a reason for the changes in valence angles in the vicinity of the nitro group. Molecules are connected into dimers by means of N—H...O hydrogen bonds, and these dimers make larger structures with the help of relatively short C—H...O hydrogen bonds.
Publisher: Wiley
Date: 19-02-2022
Abstract: Reactive extrusion printing (REP) is demonstrated as an approach to simultaneously crystallize and deposit films of the metal–organic framework (MOF) Cu 3 btc 2 (btc=1,3,5‐benzenetricarboxylate), also known as HKUST‐1. The technique co‐delivers inks of the copper(II) acetate and H 3 btc starting materials directly on‐surface and on‐location for rapid nucleation into films at room temperature. The films were analyzed using PXRD, profilometry, SEM and thermal analysis techniques and confirmed high‐quality Cu 3 btc 2 films are produced in low‐dispersity interconnected nanoparticulate form. The porosity was examined using gas adsorption which showed REP gives Cu 3 btc 2 films with open interconnected pore structures, demonstrating the method bestows features that traditional synthesis does not. REP is a technique that opens the field to time‐efficient large‐scale fabrication of MOF interfaces and should find use in a wide variety of coating application settings.
Publisher: Elsevier BV
Date: 11-2009
DOI: 10.1016/J.SAA.2009.08.040
Abstract: Zinc meso-tetraphenylporphyrin (ZnTPP) was modified in such a way to allow the effect of an asymmetric structural distortion on its optical properties to be investigated. This involved the fusion of a phenyl group to an adjacent pyrrole ring via a carbonyl bridge. With the aid of Density Functional Theory (DFT) and time-dependent DFT (TD-DFT) calculations it was found that the asymmetric distortion away from planarity induced by the carbonyl fusion resulted in a loss of degeneracy in the two lowest unoccupied molecular orbitals (LUMOs). The effect was a red shift of the electronic absorbance bands, an increased Q:B ratio from 0.046 in ZnTPP to 0.096 in the fused derivative, and the appearance of additional UV-vis peaks. This study therefore suggests that structural distortions, as well as electronic substituents may be used to alter absorbance spectra, a technique which is of interest in the design of light-harvesting dyes.
Publisher: International Union of Crystallography (IUCr)
Date: 31-01-2003
DOI: 10.1107/S0108270103001069
Abstract: The molecules of the title compound, C(12)H(6)N(2)S(4), lie on centres of symmetry. The thiophene and thiazole rings are almost planar and their planes make a dihedral angle of 1.68 (8) degrees. In the crystal structure, there is a relatively short intermolecular S...S contact distance of 3.5786 (9) A.
Publisher: American Chemical Society (ACS)
Date: 09-04-2020
Publisher: Springer Science and Business Media LLC
Date: 17-07-2015
DOI: 10.1007/S00249-015-1059-0
Abstract: Liposomal drug delivery systems (LDDSs) are promising tools used for the treatment of diseases where highly toxic pharmacological agents are administered. Currently, destabilising LDDSs by a specific stimulus at a target site remains a major challenge. The bacterial mechanosensitive channel of large conductance (MscL) presents an excellent candidate biomolecule that could be employed as a remotely controlled pore-forming nanovalve for triggered drug release from LDDSs. In this study, we developed superparamagnetic nanoparticles for activation of the MscL nanovalves by magnetic field. Synthesised CoFe2O4 nanoparticles with the radius less than 10 nm were labelled by SH groups for attachment to MscL. Activation of MscL by magnetic field with the nanoparticles attached was examined by the patch cl technique showing that the number of activated channels under r pressure increased upon application of the magnetic field. In addition, we have not observed any cytotoxicity of the nanoparticles in human cultured cells. Our study suggests the possibility of using magnetic nanoparticles as a specific trigger for activation of MscL nanovalves for drug release in LDDSs.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6SC02417C
Abstract: Design of nanometer scale artificial light harvesting and charge separating proteins enables reengineering to overcome the limitations of natural selection for efficient systems that better meet human energetic needs.
Publisher: Elsevier BV
Date: 04-2008
Publisher: Wiley
Date: 24-07-2009
Abstract: The electronic and molecular structures of a family of oligothienylenevinylenes for organic solar cells are studied by means of UV/Vis, fluorescence and Raman spectroscopy, aided by quantum chemical calculations. By using different anchoring groups, the alteration of the electronic properties upon inserting electron-withdrawing groups into different positions on the oligothienylenevinylene backbone is determined. In addition, a thorough study of the photophysical properties is carried out to understand their potential use in optoelectronic devices. The charge defect of one of these systems is analysed to elucidate the possible charge carriers photogenerated during device operation.
Publisher: American Chemical Society (ACS)
Date: 03-2007
DOI: 10.1021/JP066922R
Abstract: The structural and electronic properties of neutral and oxidized terthiophenes substituted with polyaromatic systems have been investigated using a combination of both Raman and electronic absorption spectroscopy in conjunction with density functional theory calculations. Naphthylethenyl terthiophene exhibits structural and electronic properties, in both the neutral and oxidized species, that are dominated by the terthiophene backbone, in a manner similar to that previously reported for phenylethenylterthiophene. Anthracenylethenyl terthiophene, on the other hand, displays properties that are dominated by the anthracene group. Unlike both phenylethenyl and naphthylethenyl terthiophene, which have electronic absorption spectra dominated by transitions between molecular orbitals that are delocalized throughout the molecules, the absorption spectrum of anthracenylethenyl terthiophene consists of a simple addition of the absorption bands of the separate terthiophene and anthracenylethene chromophores. This is the result of a spatial partitioning of its molecular orbitals that effectively electronically decouples the anthracene and terthiophene moieties. Upon oxidation, the naphthylethenylterthiophene sigma-dimerizes to form sexithiophene charged species and spectral signatures of the sexithiophene backbone are evident in both the electronic absorption and resonance Raman spectra. In contrast, these signatures are absent in the corresponding spectra of the oxidized anthracenylethenylterthiophene, suggesting that the anthracene group is the primary site of the structural changes induced by oxidation.
Publisher: American Chemical Society (ACS)
Date: 29-01-2010
DOI: 10.1021/JP908401K
Publisher: Wiley
Date: 11-10-2017
Publisher: American Chemical Society (ACS)
Date: 04-2004
DOI: 10.1021/JP049918T
Publisher: Wiley
Date: 18-01-2021
Abstract: Herein, the microscopic and spectroscopic characterization of a novel non‐covalent electron donor−acceptor system, in which three different metalloporphyrins ( 1 , 2 , and 3 ) play the dual role of light harvester and electron donor with SWCNTs as electron acceptor, is described. To this end, microscopy, that is, atomic force microscopy (AFM) and transmission electron microscopy (TEM) corroborate the formation of 1 ‐SWCNT, 2 ‐SWCNT, and 3 ‐SWCNT. Spectroscopy by means of Raman, fluorescence, and transient absorption spectroscopy confirmed efficient charge‐transfer interaction from photoexcited metalloporphyrins to SWCNTs in the ground and excited state of 1 ‐SWCNT, 2 ‐SWCNT, and 3 ‐SWCNT. The complementary use of spectroelectrochemical and transient absorption measurements substantiates the formation of one‐electron oxidized metalloporphyrins after photoexcitation. Multiwavelength global analysis provides insights into the charge‐separation and recombination processes in 1 ‐SWCNT, 2 ‐SWCNT, and 3 ‐SWCNT upon photoexcitation. Notably, both the charge‐separation and recombination dynamics are fastest in 2 ‐SWCNT. Importantly, the strongest interactions in the steady‐state experiments are associated with the fastest excited state decay in the time‐resolved measurements.
Publisher: Elsevier BV
Date: 07-2020
Publisher: American Chemical Society (ACS)
Date: 27-04-2020
Publisher: MDPI AG
Date: 14-02-2018
Publisher: American Chemical Society (ACS)
Date: 25-06-2019
Abstract: In this study, we show that the "Michler's base" motif can be combined in a donor-acceptor arrangement with a range of acceptor units (indandione, indandione with cyano substituents, barbituric acid, or rhodanine) to give photophysical properties that are dominated by delocalized excited states. By changing the acceptor unit and by altering the planarity of this system, it is possible to tune the low-energy absorption feature in terms of intensity from 23 000 to 67 000 M
Publisher: Elsevier BV
Date: 07-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CC30677H
Abstract: Porphyrin molecules offer immense potential as the light harvesting component of dye-sensitised nanocrystalline TiO(2) solar cells. Synthetic porphyrin dyes were amongst the first dyes trialled for sensitisation of inorganic semiconducting oxides. Today, they exhibit the best performance reported for dye-sensitised solar cells. Accompanying the significant performance improvement over the last two decades is a much improved understanding of efficiency-determining fundamental electron transfer steps, from charge photogeneration to recombination. In this feature article we highlight our recent discoveries of the influence of porphyrin molecule structure on efficiency determining electron transfer kinetics and device performance by systematically changing the molecular structure and observing electron injection and recombination kinetics using time-resolved optical and electrical probes. Despite our observation of ultrafast charge injection for all porphyrin dyes studied by transient absorption spectroscopy, the injection yield estimated using an internal standard remains below 100% and depends strongly on the molecular structure. The observed discrepancy between kinetic competition and the injection yield is attributed to non-injecting dyes, probably arising due to inhomogeneity. A very interesting sub-ns (0.5 ns to 100 ns) charge recombination channel between photo-injected electrons and porphyrin cations is observed, which is found to be more prominent in free-base porphyrin dyes with a conjugated linker. Charge recombination between the acceptor species in the redox containing electrolyte and injected electrons is shown to be an important limitation of most porphyrin-sensitised solar cells, accelerated by the presence of porphyrin molecules at the TiO(2)-electrolyte interface. This recombination reaction is strongly dependent on the porphyrin molecular structure. Bulky substituents, using a porphyrin dimer instead of a porphyrin monomer, a light soaking treatment of freshly prepared films and co-sensitization of TiO(2) with multiple dyes are shown to be successful strategies to improve electron lifetime. Finally, new developments unique to porphyrin dye-sensitised solar cells, including performance enhancements from a light exposure treatment of a zinc porphyrin dye, a significant performance improvement observed after co-sensitisation of TiO(2) with free-base and zinc porphyrin dyes and the use of porphyrin dimers with increased light harvesting in thin-film TiO(2) solar cells are described.
Publisher: Elsevier BV
Date: 03-2003
Publisher: American Chemical Society (ACS)
Date: 02-10-2023
Publisher: Wiley
Date: 26-03-2009
Abstract: Spectroscopic, electrochemical and density functional theory (DFT) methods have been employed to investigate a group of [Re(CO)(3)(HT)(phen)](+) complexes (phen = 1,10-phenanthroline), and in particular the level of electronic communication between various hole-transporting (HT) ligands and the rhenium centre. Here, the HT ligand consists of a coordinating pyridine connected to dimethylaniline group through a single-, double- or triple-bond-connecting system. Electronic absorption, resonance Raman, and steady-state emission spectroscopy combined with lifetime studies and DFT calculations suggest that multiple dpi(Re)-->pi*(phen) metal-to-ligand charge transfers (MLCTs) exist for each complex, two of which significantly absorb at about 340 and 385 nm, and one that emits at approximately 540 nm. In the complexes containing more-conjugated HT ligands, non-emissive intraligand transitions (IL(HT)) exist with energies between the ground and MLCT excited states. The overlap of these IL(HT) transitions and the absorbing MLCT of lowest energy deactivates emission resulting from about 385 nm excitation, and lowers the quantum yield and excited-state lifetimes of these complexes. Cyclic voltammetry experiments indicate that throughout the series investigated, the highest occupied molecular orbital (HOMO) of each complex is centred on the HT ligand, while the occupied molecular orbitals localised on the rhenium are lower in energy.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TC04183J
Abstract: A novel organic material (C1) with the structure D–π–A–π–D was synthesised and characterised OLEDs based on C1 were fabricated.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CC32888G
Abstract: Exfoliation of graphite was achieved using a free-base porphyrin 1 resulting in an efficient fabrication of single-layer nanographene (NG)- hybrid platelets that can be further functionalized with other nanomaterials. The novel nanographene-porphyrin hybrids reveal efficient charge transfer in the excited state.
Publisher: American Chemical Society (ACS)
Date: 31-07-2019
Abstract: The use of phototaxis to move droplets in liquids offers the opportunity to emulate natural processes such as the controlled transport of materials in fluidic environments and to undertake chemistry at specific locations. We have developed a photoactive organic droplet, whose movement in aqueous solution is driven by a photoinitiator, as a result of a light-induced reaction within the droplet generating a Marangoni flow. The photoinitiator not only drives the droplet motion but can also be used to initiate polymerization following transfer of the droplet to a specific location and its merging with a monomer-containing droplet. The same light is used to control the transport of the droplet and the polymerization. The efficacy of this droplet transport and reactor system has been demonstrated by the site-specific underwater polymerization of
Publisher: International Union of Crystallography (IUCr)
Date: 15-01-2001
DOI: 10.1107/S0108270100014852
Abstract: Crystalline 4-nitro-1-phenylimidazole, C9H7N3O2, (I), and 4'-nitro-1-phenyl-4,1'-biiimidazole, C12H9N5O2, (II), contain C-H...O and C-H...N hydrogen bonds, connecting the molecules into infinite chains. The aromatic fragments in both compounds are nearly planar. The dihedral angles between the benzene and imidazole rings are 26.78 (5) degrees in (I) and 29.36 (8) degrees in (II).
Publisher: International Union of Crystallography (IUCr)
Date: 14-06-2007
Publisher: AIP Publishing
Date: 18-04-2011
DOI: 10.1063/1.3576904
Abstract: A remarkable 300% efficiency enhancement driven by a matching increase in the short circuit current was observed in a mixed porphyrin dye-sensitized solar cell constructed from two dyes in a 3:1 ratio. Absorbed photon-to-current conversion efficiency measurements indicate an improved charge injection yield for both dyes in the mixture. Several possible origins for the observed performance enhancement are discussed.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA04641H
Abstract: A highly ordered mesoporous carbon having a large surface area is utilized as a conductive substrate to immobilize iron porphyrin catalysts for electrochemical CO 2 reduction, resulting in the selective conversion of aqueous CO 2 into CO with 92.1% faradaic efficiency.
Publisher: International Union of Crystallography (IUCr)
Date: 11-03-2006
Publisher: International Union of Crystallography (IUCr)
Date: 23-07-2005
Publisher: Elsevier BV
Date: 03-2021
Publisher: CRC Press
Date: 03-09-2018
Publisher: American Chemical Society (ACS)
Date: 07-08-2018
DOI: 10.1021/ACS.LANGMUIR.8B01550
Abstract: The negative impacts that arise from biological fouling of surfaces have driven the development of coatings with unique physical and chemical properties that are able to prevent interactions with fouling species. Here, we report on low-fouling hydrophilic coatings presenting nanoscaled features prepared from different size silica nanoparticles (SiNPs) functionalized with zwitterionic chemistries. Zwitterionic sulfobetaine siloxane (SB) was reacted to SiNPs ranging in size from 7 to 75 nm. Particle stability and grafting density were confirmed using dynamic light scattering and thermogravimetric analysis. Thin coatings of nanoparticles were prepared by spin-coating aqueous particle suspensions. The resulting coatings were characterized using scanning electron microscopy, atomic force microscopy, and contact angle goniometry. SB functionalized particle coatings displayed increased hydrophilicity compared to unmodified particle coating controls while increasing particle size correlated with increased coating roughness and increased surface area. Coatings of zwitterated particles demonstrated a high degree of nonspecific protein resistance, as measured by quartz crystal microgravimetry. Adsorption of bovine serum albumin and hydrophobin proteins were reduced by up to 91 and 94%, respectively. Adhesion of bacteria ( Escherichia coli) to zwitterion modified particle coatings were also significantly reduced over both short and long-term assays. Maximum reductions of 97% and 94% were achieved over 2 and 24 h assay periods, respectively. For unmodified particle coatings, protein adsorption and bacterial adhesion were generally reduced with increasing particle size. Adhesion of fungal spores to SB modified SiNP coatings was also reduced, however no clear trends in relation to particle size were demonstrated.
Publisher: American Chemical Society (ACS)
Date: 11-01-2013
DOI: 10.1021/IC3018387
Abstract: Transition-metal complexes of the types [Re(CO)(3)Cl(NN)], [Re(CO)(3)py(NN)](+), and [Cu(PPh(3))(2)(NN)](+), where NN = 4,4'-bis(5-phenyl-1,3,4-oxadiazol-2-yl)-2,2'-bipyridine (OX) and 4,4'-bis(N,N-diphenyl-4-[ethen-1-yl]-aniline)-2,2'-bipyridine (DPA), have been synthesized and characterized. Crystal structures for [Re(CO)(3)Cl(DPA)] and [Cu(PPh(3))(2)(OX)]BF(4) are presented. The crystal structure of the rhenium complex shows a trans arrangement of the ethylene groups, in agreement with density functional theory calculations. The structure of the copper complex displays the planar aromatic nature of the bpy-oxadiazole ligand. Density functional theory modeling of the complexes was supported by comparison of calculated and experimental normalized Raman spectra the mean absolute deviations of the complexes were <10 cm(-1). The Franck-Condon state was investigated using UV-vis and resonance Raman spectroscopic as well as density functional theory computational techniques. It was shown that the lowest energy absorption peaks are metal to ligand charge transfer and ligand-centered charge transfer for the oxadiazole- and diphenylaniline-substituted bipyridine ligands, respectively. The lowest energy excited states were characterized using transient emission and absorption spectroscopic techniques in conjunction with density functional theory calculations. These showed that the DPA complexes had ligand-centered nonemissive "dark" states with lifetimes ranging from 300 to 2000 ns.
Publisher: Elsevier BV
Date: 2020
Publisher: American Chemical Society (ACS)
Date: 15-12-2011
DOI: 10.1021/JP107615H
Publisher: American Chemical Society (ACS)
Date: 14-01-2009
DOI: 10.1021/JP8077562
Publisher: Wiley
Date: 06-11-2006
Abstract: Zn(II) and Cu(II) porphyrins with beta-conjugated barbiturate functional groups have low-energy electronic transitions which are unusual in that there are two strong bands in the Soret region. Resonance excitation of the two bands shows that each has features characteristic of both the porphyrin and barbiturate groups, with some perturbation to these features caused by the interaction of the two chromophores. The resonance Raman (RR) spectrum (lambda(exc)=413.1 nm) of the 412 nm band shows two bands at 1722 and 1743 cm(-1) attributable to C==O stretches in the substituent. Changes in frequency of porphyrin core modes due to the differing metal centres are reproduced by density functional theory calculations. The Q band RR spectra show modes with anomalous polarization which may be attributed to A(2g) modes, however no overtone or combination bands are observed.
Publisher: Wiley
Date: 17-06-2016
Abstract: A novel Zn phthalocyanine‐Zn porphyrin (ZnPc‐ZnPor) dyad ( 1 ), in which a zinc porphyrin moiety is linked covalently with an ABAB‐type zinc phthalocyanine moiety, has been designed and synthesized. The ZnPc‐ZnPor dyad 1 can absorb over a wide spectral range of visible light. The fluorescence spectrum of dyad 1 revealed an intramolecular efficient energy transfer from Zn porphyrin to Zn phthalocyanine. When dyad 1 was used as a light‐harvesting sensitizer for dye‐sensitized solar cells, the cell sensitized by dyad 1 provided a power conversion efficiency of 2.7 % under simulated air mass 1.5 global sunlight. The incident photon‐to‐current efficiency spectrum of the dyad 1 cell suggested the contribution of both components in dyad 1 for the current generation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CP01217G
Abstract: The impact of insufficient time resolution on regeneration lifetime was elucidated using regeneration lifetimes of a combination of dyes and redox mediators determined by transient absorption (TA) spectrometers with 0.5 ns and 6 ns time resolutions.
Publisher: MDPI AG
Date: 24-11-2022
Abstract: Metal organic framework (MOFs) are promising materials for electrocatalysis. However, the active sites of bulk MOFs crystal normally cannot be fully utilized because of the slow reagent penetration of pores and blockage of active sites. Herein, we report a facile way to deposit copper-benzoquinoid (Cu-THQ) on the edge-functionalized graphene (EFG) which prevented material’s aggregation. EFG used as a substrate provides higher electrical conductivity and stability in water than previously utilized graphene oxide (GO). Besides, the plate-like morphology of EFG proved to be more beneficial to support the MOF, because of the functional groups on its edge regions and much lower resistance compared to the sheet GO. Therefore, EFG can boost the resultant material’s catalytic activity for CO2 electroreduction (CO2RR). Furthermore, Cu-THQ exhibits high selectivity for formate formation in CO2RR. Representing as the only CO2 reduced liquid product, formate can be separated from gaseous products and further extracted from the electrolyte for practical use. The electrocatalytic results of Cu-THQ-EFG indicate the composite exhibits a higher current density of −3 mA/cm2 and faradaic efficiency of −0.25 V vs. RHE, corresponding to 50 mV of overpotential. Moreover, it features a less negative on-set potential of −0.22 V vs. RHE, which is close to the equilibrium potential of CO2RR (−0.2 V vs. RHE) and is 0.16 V more positive than the on-set potential of Cu-THQ-GO (−0.38 V vs. RHE).
Publisher: Elsevier BV
Date: 12-2012
Publisher: Wiley
Date: 20-01-2012
Publisher: Wiley
Date: 05-2003
Publisher: Wiley
Date: 28-05-2003
Publisher: Elsevier BV
Date: 05-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP04825G
Abstract: A new mechanism of charge photogeneration is demonstrated for the first time, based on organic molecular structures.
Publisher: American Chemical Society (ACS)
Date: 04-11-2013
DOI: 10.1021/AM403022D
Abstract: Dye sensitized solar cells (DSSCs) employing a dimer porphyrin, which was synthesised with two porphyrin units connected without conjugation, have shown that both porphyrin components can contribute to photocurrent generation, that is, more than 50 % internal quantum efficiency. In addition, the open-circuit voltage (Voc) of the DSSCs was higher than that of DSSCs using monomer porphyrins. In this paper, we first optimized cell structure and fabrication conditions. We obtained more than 80% incident photon to current conversion efficiency from the dimer porphyrin sensitized DSSCs and higher Voc and energy conversion efficiency than monomer porphyrin sensitized solar cells. To examine the origin of the higher Voc, we measured electron lifetime in the DSSCs with various conditions, and found that the dimer system increased the electron lifetime by improving the steric blocking effect of the dye layer, whilst the lack of a conjugated linker prevents an increase in the attractive force between conjugated sensitizers and the acceptor species in the electrolyte. The results support a hypothesis dispersion force is one of the factors influencing the electron lifetime in DSSCs.
Publisher: Wiley
Date: 28-07-2015
Abstract: The formation of a poly(2,6-carbazole) derivative during an electrochemical polymerization process is shown. Comparison of 3,5-bis(9-octyl-9H-carbazol-2-yl)pyridine and 3,5-bis(9-octyl-9H-carbazol-3-yl)pyridine by electrochemical and UV-Vis-NIR spectroelectrochemical measurements and DFT (density functional theory) calculation prove the formation of a poly(2,6-carbazole) derivative. Both of the compounds form stable and electroactive conjugated polymers.
Publisher: ARKAT USA, Inc.
Date: 17-12-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA05333B
Abstract: We present a simple and effective way of using metal and metal–ligand modifications to tune the electrochemical and optical properties of conducting polymers.
Publisher: Inderscience Publishers
Date: 2009
Publisher: American Chemical Society (ACS)
Date: 11-02-2022
Publisher: American Chemical Society (ACS)
Date: 29-09-2011
DOI: 10.1021/LA202598C
Abstract: The determination of the orientation and molecular density for several porphyrin dyes adsorbed on planar TiO(2) surfaces using X-ray reflectometry (XRR) is reported. Adsorption of nanoscale water layers occurred rapidly upon exposure of freshly prepared TiO(2) surfaces to ambient conditions however, this was successfully eliminated, resulting in clearly discernible adsorbed dye layers for sensitized surfaces. Adsorbed dye orientations, determined from computations constrained by the measured dye layer thickness, were calculated to have a binding tilt angle of 35°-40°. Combining the XXR data with the orientation models indicates that the porphyrins form densely packed surfaces with an intermolecular spacing of 3-4 Å, consistent with π-π stacking interactions. Changes in the molecular size of probe dyes were reflected in corresponding changes in the measured dye layer thickness, confirming the ability of this technique to resolve small variations in dye layer thickness and consequently adsorption orientation. Application of these results to understanding the behavior of dye-sensitized devices is discussed.
Publisher: World Scientific Pub Co Pte Lt
Date: 07-2018
DOI: 10.1142/S1088424618500621
Abstract: A series of zinc porphyrins, namely ZnPa and ZnPb, which exist predominantly as aggregates, are utilized in a top-down preparation of in idualized and stabilized single wall carbon nanotubes (SWCNTs). Sizable interactions in the ground state of the corresponding SWCNT/ZnPa and SWCNT/ZnPb electron donor–acceptor systems lead to charge transfer in the excited state. The product includes the simultaneous reduction of the electron-accepting SWCNTs and the oxidation of the electron-donating ZnPa and ZnPb.
Publisher: Wiley
Date: 15-07-2018
Publisher: International Union of Crystallography (IUCr)
Date: 06-06-2007
Publisher: American Chemical Society (ACS)
Date: 28-09-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA04984B
Abstract: Synthesis, spectral and electrochemical properties of a series of new panchromatic BODIPY donor–acceptor–donor derivatives, comprising carbazole conjugated with systematically elongated framework by thiophene – based linkers were investigated.
Publisher: Elsevier BV
Date: 2010
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CY00780B
Abstract: The presence of PEDOT in a thin-film containing nano-Ni and rGO lifies catalytic hydrogen generation to exceed that by Pt.
Publisher: American Chemical Society (ACS)
Date: 27-02-2015
Publisher: Elsevier BV
Date: 06-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0MA00427H
Abstract: The first working artificial photosynthetic photoanode using a light harvesting maquette, a synthetic protein with a metalloporphyrin ligated to it, has been fabricated that generates remarkably high photocurrent for a protein-based device.
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B926087K
Abstract: Ionic liquid electrolytes based on a number of imidazolium, quaternary ammonium and phosphonium cations have been developed for porphyrin dye sensitised solar cells yielding efficiencies of up to 5.2% at 0.68 Sun.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3SC51026C
Publisher: Elsevier BV
Date: 04-2021
Publisher: Wiley
Date: 10-01-2020
Publisher: American Chemical Society (ACS)
Date: 07-07-2007
DOI: 10.1021/JP071596G
Abstract: A spectroscopic and computational study of a series of 2,5-bis(2-thien-2-ylethenyl) thiophene-based oligomers with a para-R-arylethenyl substituent is reported. The primary aim of this investigation is to increase understanding of how charge moves through these molecules by comparing the neutral and oxidized structures for each molecule. To this end, the B3LYP/6-31G(d) computational method was used to calculate the geometry and vibrational spectra for all molecules considered and their oxidation products. For vibrational data, mean absolute deviations for frequencies between experimental and theoretical results ranging from 2 to 18 cm-1 were obtained. Experimental Raman spectroscopy, in conjunction with calculated bond length analyses, was used to gain an insight into the position and delocalization of the charged defect on the oxidized oligomers. The relative frequencies of different ethylene stretching modes served as a particularly useful probe in this regard. It was found that the ethenyl spacers do not impede pi-electron delocalization and, therefore, give rise to a longer conjugation length relative to the corresponding terthiophenes. Furthermore, the para-R-arylethenyl substituent was found to orientate the charged defect toward a specific region of the 2,5-bis(2-thien-2-ylethenyl)thiophene conjugation path.
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CC13205A
Abstract: We describe a porphyrin dye-sensitised solar cell utilising a solid state electrolyte containing the I(-)/I(3)(-) redox couple, which yields a performance of 5.3% under moderate light intensity and 4.8% at full sun.
Publisher: Elsevier BV
Date: 09-2005
Publisher: AIP
Date: 2010
DOI: 10.1063/1.3482522
Publisher: International Union of Crystallography (IUCr)
Date: 05-07-2007
Publisher: Wiley
Date: 14-09-2015
Abstract: A series of zinc porphyrins substituted at adjacent β-positions with a CN group and para-substituted ethenyl/ethynyl-phenyl group have been studied using electronic absorption spectroscopy, resonance Raman spectroscopy and DFT calculations. The oxidative nucleophilic substitution of hydrogen was utilized for the introduction of a cyano substituent on the porphyrin ring. This modification has a remarkable electronic effect on the ring. The resulting porphyrin cyanoaldehyde was further modified in Wittig condensations to give series of arylalkene- and arylalkyne-substituted derivatives. This substitution pattern caused significant redshifting and broadening of the B band, tuning from 433-446 nm. Additionally the Q/B band intensity ratios show much higher values than observed for the parent porphyrin ZnTPP (0.20 vs. 0.03). Careful analysis of the electronic transitions using DFT and resonance Raman spectroscopy reveal that the substituent does not significantly perturb the electronic structure of the porphyrin core, which is still well described by Gouterman's four-orbital model. However, the substituents do play a role in elongating the conjugation length and this results in the observed spectral changes.
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 05-2018
Publisher: Wiley
Date: 29-11-2007
Publisher: Wiley
Date: 12-04-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CP03177F
Abstract: Fine-tuning of the bandgap structure of undoped highly ordered TiO 2 nanotube arrays for efficient photo-electrochemical water oxidation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8EE03403F
Abstract: A 3D iron porphyrin/graphene hydrogel electrocatalyst affords highly efficient, durable and selective CO 2 reduction to CO at a low overpotential.
Publisher: International Union of Crystallography (IUCr)
Date: 30-11-2006
Publisher: MDPI AG
Date: 23-04-2021
DOI: 10.3390/MA14092167
Abstract: During research on cross-linked conducting polymers, double-functionalized monomers were synthesized. Two subunits potentially able to undergo oxidative coupling were used—perimidine and, respectively, carbazole, 3,6-di(hexylthiophene)carbazole or 3,6-di(decyloxythiophene)carbazole alkyl and alkoxy chains as groups supporting molecular ordering and 14H-benzo[4,5]isoquinone[2,1-a]perimidin-14-one segment promoting CH⋯O interactions and π–π stacking. Electrochemical, spectroelectrochemical, and density functional theory (DFT) studies have shown that potential-controlled oxidation enables polarization of a specific monomer subunit, thus allowing for simultaneous coupling via perimidine and/or carbazole, but mainly leading to dimer formation. The reason for this was the considerable stability of the dicationic and tetracationic π-dimers over covalent bonding. In the case of perimidine-3,6-di(hexylthiophene)carbazole, the polymer was not obtained due to the steric hindrance of the alkyl substituents preventing the coupling of the monomer radical cations. The only linear π-conjugated polymer was obtained through di(decyloxythiophene)carbazole segment from perimidine-di(decyloxythiophene)-carbazole precursor. Due to the significant difference in potentials between subsequent oxidation states of monomer, it was impossible to polarize the entire molecule, so that both directions of coupling could be equally favored. Subsequent oxidation of this polymer to polarize the side perimidine groups did not allow further crosslinking, because rather the π–π interactions between these perimidine segments dominate in the solid product.
Publisher: American Chemical Society (ACS)
Date: 30-05-2017
Abstract: The growing need to develop surfaces able to effectively resist biological fouling has resulted in the widespread investigation of nanomaterials with potential antifouling properties. However, the preparation of effective antifouling coatings is limited by the availability of reactive surface functional groups and our ability to carefully control and organize chemistries at a materials' interface. Here, we present two methods of preparing hydrophilic low-fouling surface coatings through reaction of silica-nanoparticle suspensions and predeposited silica-nanoparticle films with zwitterionic sulfobetaine (SB). Silica-nanoparticle suspensions were functionalized with SB across three pH conditions and deposited as thin films via a simple spin-coating process to generate hydrophilic antifouling coatings. In addition, coatings of predeposited silica nanoparticles were surface functionalized via exposure to zwitterionic solutions. Quartz crystal microgravimetry with dissipation monitoring was employed as a high throughput technique for monitoring and optimizing reaction to the silica-nanoparticle surfaces. Functionalization of nanoparticle films was rapid and could be achieved over a wide pH range and at low zwitterion concentrations. All functionalized particle surfaces presented a high degree of wettability and resulted in large reductions in adsorption of bovine serum albumin protein. Particle coatings also showed a reduction in adhesion of fungal spores (Epicoccum nigrum) and bacteria (Escherichia coli) by up to 87 and 96%, respectively. These results indicate the potential for functionalized nanosilicas to be further developed as versatile fouling-resistant coatings for widespread coating applications.
Publisher: International Union of Crystallography (IUCr)
Date: 06-06-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CC01349A
Abstract: Reactive inkjet printing post-synthetically patterns MOF films rapidly and controllably.
Publisher: American Chemical Society (ACS)
Date: 08-06-2023
Publisher: American Chemical Society (ACS)
Date: 26-03-2010
DOI: 10.1021/MA902782X
Publisher: American Chemical Society (ACS)
Date: 15-04-2022
Publisher: American Chemical Society (ACS)
Date: 18-03-2011
DOI: 10.1021/JA1114634
Abstract: An electroactive nitrospiropyran-substituted polyterthiophene, poly(2-(3,3''-dimethylindoline-6'-nitrobenzospiropyranyl)ethyl 4,4''-didecyloxy-2,2':5',2''-terthiophene-3'-acetate), has been synthesized for the first time. The spiropyran, incorporated into the polymer backbone by covalent attachment to the alkoxyterthiophene monomer units, leads to multiple colored states as a result of both photochemical and electrochemical isomerization of the spiropyran moiety to merocyanine forms as well as electrochemical oxidation of the polyterthiophene backbone and the merocyanine substituents. While electrochemical polymerization of the terthiophene monomer can take place without oxidation of the spiropyran, increasing the oxidation potential leads to complex electrochemistry that clearly involves this substituent. To understand this complex behavior, the first detailed electrochemical study of the oxidation of the precursor spiropyran, 1-(2-hydroxyethyl)-3,3-dimethylindoline-6'-nitrobenzospiropyran, was undertaken, showing that, in solution, an irreversible electrochemical oxidation of the spiropyran occurs leading to reversible redox behavior of at least two merocyanine isomers. With these insights, an extensive electrochemical and spectroelectrochemical study of the nitrospiropyran-substituted polyterthiophene films reveals an initial irreversible electrochemical oxidative ring-opening of the spiropyran to oxidized merocyanine. Subsequent reduction and cyclic voltammetry of the resulting nitromerocyanine-substituted polyterthiophene film gives rise to the formation of both merocyanine π-dimers or oligomers and π-radical cation dimers, between polymer chains. Although merocyanine formation is not electrochemically reversible, the spiropyran can be photochemically regenerated, through irradiation with visible light. Subsequent electrochemical oxidation of the nitrospiropyran-substituted polymer reduces the efficiency of the spiropyran to merocyanine isomerization, providing electrochemical control over the polymer properties. SEM and AFM images support the conclusion that the bulky spiropyran substituent is electrochemically isomerized to the planar merocyanine moiety, affording a smoother polymer film. The conductivity of the freestanding polymer film was found to be 0.4 S cm(-1).
Publisher: International Union of Crystallography (IUCr)
Date: 05-07-2007
Publisher: Elsevier BV
Date: 07-1996
Publisher: Elsevier BV
Date: 12-2007
Publisher: International Union of Crystallography (IUCr)
Date: 13-07-2007
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 2007
Publisher: Elsevier BV
Date: 04-2011
Publisher: Elsevier BV
Date: 02-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0NJ04913A
Abstract: Photocontrolled directional transport in both 2D and 3D of water-in-oil droplets was achieved by merocyanine/spiropyran photoisomerization in the droplet.
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B909709K
Publisher: American Chemical Society (ACS)
Date: 17-01-2019
Publisher: Elsevier BV
Date: 17-02-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3SC50812A
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TC30479E
Publisher: International Union of Crystallography (IUCr)
Date: 08-06-2007
Location: New Zealand
Start Date: 2019
End Date: 2021
Funder: Australian Research Council
View Funded ActivityStart Date: 2015
End Date: 2019
Funder: Australian Research Council
View Funded ActivityStart Date: 2012
End Date: 2016
Funder: Australian Research Council
View Funded ActivityStart Date: 2014
End Date: 2017
Funder: European Commission
View Funded ActivityStart Date: 2018
End Date: 2021
Funder: Australian Renewable Energy Agency
View Funded ActivityStart Date: 2012
End Date: 12-2016
Amount: $350,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 12-2015
Amount: $360,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2019
End Date: 12-2024
Amount: $300,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2015
End Date: 12-2019
Amount: $394,700.00
Funder: Australian Research Council
View Funded Activity