ORCID Profile
0000-0003-0738-9349
Current Organisations
Quaid-i-Azam University
,
University of New South Wales
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Publisher: Frontiers Media SA
Date: 13-05-2020
Publisher: African Journals Online (AJOL)
Date: 28-10-2020
Abstract: Biologically active triazole Schiff base ligand 2,4-dichloro-6-[(1H-1,2,4-triazol-3-ylimino)methyl]phenol (A) has been synthesized by the condensation reaction of an equimolar amount of 1H-1,2,4-triazole-3-amine and 3,5-dichlorosalicylaldehyde and then it coordinated with salts of metals [VO(IV), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)] in 2:1 molar ratio to derive a series of transition metal chelates (1)-(6). All the compounds were characterized by various physical, spectral, analytical techniques and elemental analysis. Spectral characterization and magnetic moment data of complexes revealed square pyramidal geometry for vanadium complex and octahedral for remaining (2)-(6) complexes. Quantum chemical calculation has been carried out to explore optimized geometry and electronic structure of the ligand. Density functional theory (DFT) with B3LYP/6-311+g(d,p) method was performed to determine vibrational bands, frontier molecular orbitals (FMOs) and natural bond analysis (NBO) of the ligand. NBO analysis showed that the ligand bears higher molecular stability because of hyper conjugate interactions. Computational study results revealed that there was a close interaction of theoretical and experimental spectroscopic data. Global reactivity descriptors calculated by the energies of FMOs, indicated ligand to be bioactive. The synthesized compounds were studied for antibacterial, antifungal, antioxidant and antiglycation activity and the results revealed that ligand has remarkable activity which considerably increased upon chelation. KEY WORDS: Triazole ligand, Transition metal chelates, Antibacterial, Antifungal, Antioxidant, Computational study Bull. Chem. Soc. Ethiop. 2020, 34(2), 335-351 DOI: 0.4314/bcse.v34i2.11
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 02-2019
Publisher: Asian Pacific Organization for Cancer Prevention
Date: 11-04-2016
DOI: 10.7314/APJCP.2016.17.3.923
Abstract: The classic BCR-ABL1-negative myeloproliferative neoplasm is an operational sub-category of MPNs that includes polycythemia vera (PV), essential thrombocythemia (ET), and primary myelofibrosis (PMF). The JAK2V617F mutation is found in ~ 95% of PV and 50-60% of ET or PMF. In most of the remaining JAK2V617F- negative PV cases, JAK2 exon 12 mutations are present. Amongst the JAK2V617F-negative ET or PMF 5-10% of patients carry mutations in the MPL gene. Prior to 2013, there was no specific molecular marker described in the remaining 30-40% ET and PMF. In December 2013, two research groups independently reported mutations in the gene CALR found specifically in ET (67-71%) and PMF (56-88%) but not in PV. Initially CALR mutations were reported mutually exclusive with JAK2 or MPL. However, co-occurrence of CALR mutations with JAK2V617F has been reported recently in a few MPN cases. Many studies have reported important diagnostic and prognostic significance of CALR mutations in ET and PMF patients and CALR mutation screening has been proposed to be incorporated into WHO diagnostic criteria for MPN. It is suggestive in diagnostic workup of MPN that CALR mutations should not be studied in MPN patients who carry JAK2 or MPL mutations. However JAK2V617F and CALR positive patients might have a different phenotype and clinical course, distinct from the JAK2-positive or CALR-positive subgroups and identification of the true frequency of these patients may be an important factor for defining the prognosis, risk factors and outcomes for MPN patients.
Publisher: Elsevier BV
Date: 10-2018
Publisher: American Chemical Society (ACS)
Date: 14-03-2018
DOI: 10.1021/ACS.LANGMUIR.7B02786
Abstract: We demonstrate for the first time the application of p-NiFe
Publisher: Elsevier BV
Date: 03-2020
Publisher: Frontiers Media SA
Date: 24-06-2021
DOI: 10.3389/FCHEM.2021.686968
Abstract: Layered double hydroxides (LDH) are being used as electrocatalysts for oxygen evolution reactions (OERs). However, low current densities limit their practical applications. Herein, we report a facile and economic synthesis of an iron-copper based LDH integrated with a cobalt-based metal-organic framework (ZIF-12) to form LDH-ZIF-12 composite (1) through a co-precipitation method. The as-synthesized composite 1 requires a low overpotential of 337 mV to achieve a catalytic current density of 10 mA cm −2 with a Tafel slope of 89 mV dec −1 . Tafel analysis further demonstrates that 1 exhibits a slope of 89 mV dec −1 which is much lower than the slope of 284 mV dec −1 for LDH and 172 mV dec −1 for ZIF-12. The slope value of 1 is also lower than previously reported electrocatalysts, including Ni-Co LDH (113 mV dec −1 ) and Zn-Co LDH nanosheets (101 mV dec −1 ), under similar conditions. Controlled potential electrolysis and stability test experiments show the potential application of 1 as a heterogeneous electrocatalyst for water oxidation.
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 10-2021
Publisher: Springer Science and Business Media LLC
Date: 09-02-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B922698M
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 03-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2YA00110A
Abstract: Oxygenate photo-reforming: A process of harnessing the redox ability of a photocatalyst to simultaneously drive the reduction of H + into H 2 and oxidation of organics.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4RA13482F
Abstract: A simple and facile method is adopted for the synthesis of pure and catalyst free carbon material for supercapacitor applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B924818H
Abstract: A coordination polymer, [Co(II)(bIM)(acetate)] (bIM = benzimidazole) was synthesized using a solvothermal method the complex has a two dimensional non-interpenetrated network structure and exhibits a spin-canted antiferromagnetic behaviour at low temperature and a high coercive field.
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 06-2019
DOI: 10.1016/J.JCIS.2019.03.018
Abstract: The dearth of an efficient, robust, abundant and cost-effective water oxidation catalyst is debatably the major hurdle for the technological advancement of artificial photosynthesis devices. Herein, a three dimensional (3D) cobalt-based coordination polymer {[Co
Publisher: Elsevier BV
Date: 07-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2RA05036F
Abstract: Layered double hydroxides (LDH) have potential to catalyze the sluggish oxygen evolution reaction.
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0DT00600A
Abstract: The use of 1,3,5-benzene tricarboxylic acid (H(3)btc) as an organic linker has allowed us to achieve the rational design of two pairs of isostructural coordination polymers having molecular formulae [M(2)(btc)(F)](n) (M(ii) = Mn (1), Co (2)) and [M(3)(btc)(Hbtc)(OH)(H(2)O)(11)](n) (M(ii) = Fe (3), Co (4)) where btc and Hbtc represent the fully and doubly de-protonated tricarboxylates respectively. These compounds were synthesized using hydrothermal methods and characterized by thermal analysis and variable temperature magnetic measurements. The X-ray analysis reveals that compounds 1 and 2 crystallize in the monoclinic space group C2/c while compounds 3 and 4 crystallize in the monoclinic space group C2. Compounds 1 and 2 feature fluoride bridged 1D metal chains linked together via carboxylate groups of btc, whilst compounds 3 and 4 consist of 1D zigzag chains having strong hydrogen bonds with neighbouring chains. Variable temperature magnetic measurements show an overall antiferromagnetic behaviour for compounds 1, 2 and 4, with no indication of magnetic ordering phenomena in the temperature range from 300-2 K. As 3 and 4 are isostructural, we assume that the magnetic properties are similar.
Publisher: American Chemical Society (ACS)
Date: 06-01-2020
Abstract: Here, we present the fabrication of a reduced graphene oxide-supported PdCa (PdCa/rGO) alloyed catalyst via a NaBH
Publisher: Sociedade Brasileira de Quimica (SBQ)
Date: 2015
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 06-2009
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5RA23222H
Abstract: ZIF-12 is converted to Co/N-CNTs at 950 °C under an argon atmosphere. The obtained hybrid nanocomposite is used for LIBs application as an anode material with superior charge storage performance.
Publisher: Wiley
Date: 08-09-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6CY02328B
Abstract: Water splitting over Cu–Cu 2 O/TiO 2 photocatalysts.
Publisher: American Chemical Society (ACS)
Date: 05-08-2016
Abstract: Boosting the durability of Pt nanoparticles by controlling the composition and morphology is extremely important for fuel cells commercialization. We deposit the Pt-Cu alloy nanoparticles over high surface area carbon in different metallic molar ratios and optimize the conditions to achieve desired material. The novel bimetallic electro-catalyst {Pt-Cu/PC-950 (15:15%)} offers exceptional electrocatalytic activity when tested for both oxygen reduction reaction and methanol oxidation reactions. A high mass activity of 0.043 mA/μgPt (based on Pt mass) is recorded for ORR. An outstanding longevity of this electro-catalyst is noticed when compared to 20 wt % Pt loaded either on PC-950 or commercial carbon. The high surface area carbon support offers enhanced activity and prevents the nanoparticles from agglomeration, migration, and dissolution as evident by TEM analysis.
Publisher: Elsevier BV
Date: 09-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2RA05145A
Abstract: The phenomenally low potential required by MOF 1 for the UOR can be an efficient replacement for the sluggish OER.
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 2019
Publisher: American Chemical Society (ACS)
Date: 03-08-2010
DOI: 10.1021/CG1007389
Publisher: American Chemical Society (ACS)
Date: 16-12-2016
Abstract: Recently, photoelectrochemical conversion (PEC) of water into fuel is attracting great attention of researchers due to its outstanding benefits. Herein, a systematic study on PEC of water using CuFe
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 10-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8QI00355F
Abstract: Monodispersed Cu and Ni nanoparticles are deposited over TiO 2 using a hetero-bimetallic coordination polymer for efficient photocatalytic water splitting.
Publisher: The Royal Society
Date: 02-2016
Abstract: We have investigated the attachment of azobenzene photochromic switches on the modified surface of cadmium sulfide (CdS) quantum dots (QDs). The modification of CdS QDs is done by varying the concentration of the capping agent (mercaptoacetic acid) and NH 3 in order to control the size of the QDs. The X-ray diffraction studies revealed that the crystallite size of CdS QDs ranged from 6 to 10 nm. The azobenzene photochromic derivatives bis(4-hydroxybenzene-1-azo)4,4′(1,1′ diphenylmethane) (I) and 4,4′-diazenyldibenzoic acid (II) were synthesized and attached with surface-modified CdS QDs to make fluorophore–photochrome CdS-(I) and CdS-(II) dyad assemblies. Upon UV irradiation, the photochromic compounds (I) and (II) undergo a reversible trans – cis isomerization. The photo-induced trans – cis transformation helps to transfer photo-excited electrons from the conduction band of the CdS QDs to the lowest unoccupied molecular orbital of cis isomer of photochromic compounds (I) and (II). As a result, the fluorescence of CdS-(I) and CdS-(II) dyads is suppressed approximately five times compared to bare CdS QDs. The fluorescence modulation in such systems could help to design luminescent probes for bioimaging applications.
Publisher: Elsevier BV
Date: 06-2008
Publisher: American Chemical Society (ACS)
Date: 18-08-2017
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 05-2013
Publisher: Frontiers Media SA
Date: 05-11-2019
Publisher: Elsevier BV
Date: 08-2018
Publisher: Wiley
Date: 04-10-2017
Publisher: American Chemical Society (ACS)
Date: 02-03-2021
Publisher: Elsevier BV
Date: 09-2017
Publisher: Asian Pacific Organization for Cancer Prevention
Date: 04-02-2015
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 11-2014
Publisher: Pleiades Publishing Ltd
Date: 08-2018
Publisher: Elsevier BV
Date: 11-2017
Publisher: American Chemical Society (ACS)
Date: 16-11-2016
Abstract: High activity, a low rate of CO poisoning, and long-term stability of Pd electro-catalysts are necessary for practical use as an anode material in direct formic acid fuel cells. Achieving a high degree of Pd nanoparticle dispersion on a carbon support, without agglomeration, while maintaining a facile electron transfer through the catalyst surface are two challenging tasks to be overcome in fulfilling this aim. Herein, we report the effect of addition of La/La-oxides on the efficiency of Pd nanoparticles supported on reduced graphene oxide (rGO) for formic acid electro-oxidation reaction. A series of electro-catalysts with different Pd-La molar ratios were successfully synthesized and characterized using a range of techniques including PXRD, XPS, TEM, FTIR, and Raman spectroscopy and then tested as anode materials for direct formic acid fuel cells. We explore that the lanthanum species (La/La-oxide) significantly promote the activity and stability of Pd catalyst toward electrocatalytic oxidation of formic acid. The metallic ratio is found to be critical, and the activity order of various catalysts is observed as follows Pd
Publisher: Wiley
Date: 14-05-2020
Publisher: American Chemical Society (ACS)
Date: 30-10-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B922750D
Abstract: A 3D metal-organic framework, [Na{Mn(3)(Hbtc)(2)(btc)}.5H(2)O](n) () (H(3)btc = 1,3,5-benzene tricarboxylic acid), was synthesized under hydrothermal conditions. The structure of was established by single crystal X-ray diffraction analysis crystallizes in the monoclinic space group P2/c, a = 9.753(3) A, b = 12.751(2) A, c = 14.174(4) A, beta = 109.41(1) degrees . The complex is isostructural to previously reported MIL-45 and consists of one dimensional wave like chains of carboxylate bridged hexa-coordinated Mn(ii) ions. Variable temperature magnetic susceptibility measurements revealed dominant antiferromagnetic exchange interactions and the intra-chain exchange constants J(1) = -2.4 cm(-1) and J(2) = -0.6 cm(-1) compare well with literature values for similar materials. Inter-chain interactions are expected to be very small in this compound and there is no indication of magnetic ordering phenomena in the temperature range from 300-2 K.
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 08-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CY02219K
Abstract: Pd–Ag bimetallic and monometallic nanoparticles were decorated on g-C 3 N 4 and evaluated for their ability to produce H 2 through water splitting reactions.
Publisher: Wiley
Date: 31-08-2017
Publisher: Springer Science and Business Media LLC
Date: 12-01-2014
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 07-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NJ01153K
Abstract: Frequent exposure to ultraviolet (UV) radiation without any protection turns out to be a fatal threat leading to skin cancer, necessitating the use of sunscreen cosmetic product with enhanced efficiency to dissipate the UV absorbed energy.
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B924241D
Abstract: A novel sequence for reversible second-order nonlinear optical (NLO) molecular switching with protonation/deprotonation has been achieved and tuned as well. The NLO switching with first hyperpolarizabilities (beta(0)) as low as 14 x 10(-30) esu (Off-phase) and as large as 1189 x 10(-30) esu (On-phase) have been computed by using density functional theory (DFT). Remarkably large differences between the beta(0) values of benzimidazole containing chromophores and their deprotonated anions have shown their significant potential for a new type of NLO molecular switching, as (1-(4-methoxyphenyl)-2-(2-thienyl)pyrrolyl)-1,3-benzimidazole anion (1(-)) has a beta(0) value computed to be 61 x 10(-30) esu, which is 4 times larger than its neutral molecule 1. This beta(0) value has been tuned up to 2028 x 10(-30) esu by effective substitutions in the derivatives of 1(-) (1a(-), 1b(-), 1c(-), and 1d(-)). Interestingly, the substituted compounds have illustrated robustly large off-on NLO switching with a difference in beta(0) values of 7, 63, 85 and 75 times larger than their neutral counterparts, respectively. TD-DFT calculations along with natural bond orbital (NBO), frontier molecular orbitals (FMOs) and molecular electrostatic potential (MEP) analyses show that the abstraction of an imido proton brings about a change in push-pull configurations resulting in a red shift for both absorption and emission spectra which subsequently leads to a high performance second-order NLO molecular switching. A similar trend of NLO switching in F(-) compounds of these chromophores has also been observed with significantly large beta(0) values having analogous electro-optical properties like deprotonated anions. Furthermore, gas-phase acidity (GPA) calculations for the neutral molecule 1 and its derivatives (1a, 1b, 1c, and 1d) have also revealed that these are rationally potent nitrogen acids and can easily be dissociated to produce stable deprotonated anions.
Publisher: Elsevier BV
Date: 10-2016
Publisher: American Chemical Society (ACS)
Date: 08-09-2022
Publisher: Elsevier BV
Date: 05-2016
Publisher: American Chemical Society (ACS)
Date: 07-2016
Abstract: The development of highly competent electrocatalysts for the sluggish oxygen reduction reaction (ORR) at cathodes of proton-exchange membrane fuel cells (PEMFCs) is extremely important for their long-term operation and wide applications. Herein, we present highly efficient ORR electrocatalysts based on Pt/Ni bimetallic nanoparticles dispersed on highly porous carbon obtained via pyrolysis of a metal-organic framework MOF-5. In comparison to the commercial Pt/C (20%), the electrocatalyst Pt-Ni/PC 950 (15:15%) in this study exhibits a pronounced positive shift of 90 mV in Eonset. In addition, it also demonstrates excellent long-term stability and durability during the 500-cycle continue-oxygen-supply (COS) accelerating durability tests (ADTs). The significantly improved activity and stability of Pt-Ni/PC 950 (15:15%) can be attributed to the Pt electron interaction with Ni and carbon support as has been proved in X-ray and microscopic analysis.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EW00368J
Abstract: The coexistence of organic contaminants and Cr metal in industrial sewage pollutes drinking water reservoirs.
No related grants have been discovered for muhammad nadeem.