ORCID Profile
0000-0003-1674-8462
Current Organisation
Consejo Superior de Investigaciones Científicas
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Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7FD90077E
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B403062A
Publisher: Wiley
Date: 31-07-2019
Abstract: A series of symmetrically bis-4-methoxybenzyl (4MB) N-substituted 1,4-diketopyrrolo[3,4-c]pyrrole (DPP) derivatives have been synthesized. The 4MB unit makes the DPP core soluble, and shows subtle modification of up to 0.2 eV in ground and excited states of the core when compared with related alkyl derivatives. Absorption and emission spectroscopy, as well as electrochemical and computational methods have been employed to prove the importance of the peripheral aryl units on the donor/ acceptor properties of the molecules. The 4MB products are highly fluorescent (quantum yields approaching 100 % in solution), with a unique distribution of frontier states shown by spectroelectrochemistry. The solid-state fluorescence correlates with the X-ray crystal structures of the compounds, a Stokes shift of approximately 80 nm is seen for two of the compounds. The frontier energy levels show that this subtle substitutional change could be of future use in molecular energy level tailoring in these, and related, materials for organic (opto)electronics.
Publisher: Springer Science and Business Media LLC
Date: 21-11-2016
DOI: 10.1038/SREP37352
Abstract: In contrast with conventional single-molecule junctions, in which the current flows parallel to the long axis or plane of a molecule, we investigate the transport properties of M(II)-5,15-diphenylporphyrin (M-DPP) single-molecule junctions (M=Co, Ni, Cu, or Zn alent metal ions), in which the current flows perpendicular to the plane of the porphyrin. Novel STM-based conductance measurements combined with quantum transport calculations demonstrate that current-perpendicular-to-the-plane (CPP) junctions have three-orders-of-magnitude higher electrical conductances than their current-in-plane (CIP) counterparts, ranging from 2.10 −2 G 0 for Ni-DPP up to 8.10 −2 G 0 for Zn-DPP. The metal ion in the center of the DPP skeletons is strongly coordinated with the nitrogens of the pyridyl coated electrodes, with a binding energy that is sensitive to the choice of metal ion. We find that the binding energies of Zn-DPP and Co-DPP are significantly higher than those of Ni-DPP and Cu-DPP. Therefore when combined with its higher conductance, we identify Zn-DPP as the favoured candidate for high-conductance CPP single-molecule devices.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7FD90076G
Publisher: Elsevier BV
Date: 08-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CE00039J
Abstract: Crystal structures of the title compounds show erse packing by interactions of auxochromes giving materials with varied optoelectronic properties.
Publisher: Wiley
Date: 17-10-1997
Publisher: American Chemical Society (ACS)
Date: 28-04-1998
DOI: 10.1021/JA9720873
Publisher: American Chemical Society (ACS)
Date: 05-1997
DOI: 10.1021/JO9612584
Abstract: The template-directed syntheses of three [2]rotaxanes are described. They all have dumbbell components, with both hydroquinone and resorcinol rings inserted into polyether chains terminated by tetraarylmethane stoppers, that become encircled during the key self-assembly processes by the tetracationic cyclophane, cyclobis(paraquat-p-phenylene), with its two pi-electron deficient bipyridinium units. It has been demonstrated by low-temperature (1)H NMR spectroscopy that the pi-electron deficient tetracationic cyclophane has a remarkably high preference to reside around the hydroquinone ring in these molecular shuttles. This observation illustrates how a very small constitutional difference-hydroquinone versus resorcinol recognition sites-can lead to the overwhelming preference for one translational isomer over another in this particular range of [2]rotaxanes.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CE02157C
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CS90037F
Abstract: Guest editors David B. Amabilino and Philip A. Gale introduce the Supramolecular Chemistry Anniversary issue of Chemical Society Reviews .
Publisher: American Chemical Society (ACS)
Date: 03-07-2014
DOI: 10.1021/NL501884G
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: No location found
Start Date: 2016
End Date: 2020
Funder: Engineering and Physical Sciences Research Council
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