Tuning the electrical conductance of metalloporphyrin supramolecular wires

Noori, Mohammed and Aragones, Albert C. and Di Palma, Giuseppe and Darwish, Nadium and Bailey, Steven W.D. and Al-Galiby, Quisy and Grace, Iain and Amabilino, David B. and Gonzalez-Campo, Arántzazu and Díez-Pérez, Ismael and Colin J., Lambert (2016) Tuning the electrical conductance of metalloporphyrin supramolecular wires. Scientific Reports, 6 . 37352/1-37352/7. ISSN 2045-2322

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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 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 conductanc 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: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Chemistry
Identification Number: https://doi.org/10.1038/srep37352
Depositing User: Bramwell, Roseanna
Date Deposited: 20 Dec 2016 09:17
Last Modified: 20 Dec 2016 17:38
URI: http://eprints.nottingham.ac.uk/id/eprint/39429

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