Tuning the electrical conductance of metalloporphyrin supramolecular wires

Noori, Mohammed and Aragonès, Albert and Di Palma, Giuseppe and Darwish, Nadim and Bailey, Steven William Dennis and Al-Galiby, Qusiy and Grace, Iain Mark and Amabilino, David B. and Gonzalez-Campo, Arantzazu and Díez-Pérez, Ismael and Lambert, Colin John (2016) Tuning the electrical conductance of metalloporphyrin supramolecular wires. Scientific Reports, 6 (37352). ISSN 2045-2322

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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 divalent 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 G0 for Ni-DPP up to 8.10−2 G0 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

Item Type: Journal Article
Journal or Publication Title: Scientific Reports
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1000
Departments: Faculty of Science and Technology > Physics
ID Code: 83773
Deposited By: ep_importer_pure
Deposited On: 22 Dec 2016 12:02
Refereed?: Yes
Published?: Published
Last Modified: 08 Oct 2019 02:30
URI: https://eprints.lancs.ac.uk/id/eprint/83773

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