R. Davidson
Synthesis, Electrochemistry, and Single-Molecule Conductance of Bimetallic 2,3,5,6-Tetra(pyridine-2-yl)pyrazine-Based Complexes
Davidson, R.; Liang, J.H.; Milan, D.C.; Mao, B.W.; Nichols, R.J.; Higgins, S.J.; Yufit, D.S.; Beeby, A.; Low, P.J.
Authors
J.H. Liang
D.C. Milan
B.W. Mao
R.J. Nichols
S.J. Higgins
D.S. Yufit
Professor Andrew Beeby andrew.beeby@durham.ac.uk
Professor
P.J. Low
Abstract
The ligands 4′-(4-(methylthio)phenyl)-2,2′:6′,2″-terpyridine (L1), 4′-((4-(methylthio)phenyl)ethynyl)- 2,2′:6′,2″-terpyridine (L2), and bis(tridentate) bridging ligand 2,3,5,6-tetra(pyridine-2-yl)pyrazine (tpp) were used to prepare the complexes [Ru(L1)2][PF6]2 ([1][PF6]2, [Ru(L2)2][PF6]2 ([2][PF6]2), [{(L1)Ru}(μ-tpp){Ru(L1)}][PF6]4 ([3][PF6]4), and [{(L2)Ru}(μ-tpp){Ru(L2)}][PF6]4 ([4][PF6]4). Crystallographically determined structures give S···S distances of up to 32.0 Å in [4]4+. On the basis of electrochemical estimates, the highest occupied molecular orbitals of these complexes fall between −5.55 and −5.85 eV, close to the work function of clean gold (5.1–5.3 eV). The decay of conductance with molecular length across this series of molecules is approximately exponential, giving rise to a decay constant (pseudo β-value) of 1.5 nm–1, falling between decay factors for oligoynes and oligophenylenes. The results are consistent with a tunnelling mechanism for the single-molecule conductance behavior.
Citation
Davidson, R., Liang, J., Milan, D., Mao, B., Nichols, R., Higgins, S., …Low, P. (2015). Synthesis, Electrochemistry, and Single-Molecule Conductance of Bimetallic 2,3,5,6-Tetra(pyridine-2-yl)pyrazine-Based Complexes. Inorganic Chemistry, 54(11), 5487-5494. https://doi.org/10.1021/acs.inorgchem.5b00507
Journal Article Type | Article |
---|---|
Online Publication Date | May 14, 2015 |
Publication Date | Jun 1, 2015 |
Deposit Date | Apr 15, 2016 |
Publicly Available Date | May 14, 2016 |
Journal | Inorganic Chemistry |
Print ISSN | 0020-1669 |
Electronic ISSN | 1520-510X |
Publisher | American Chemical Society |
Peer Reviewed | Peer Reviewed |
Volume | 54 |
Issue | 11 |
Pages | 5487-5494 |
DOI | https://doi.org/10.1021/acs.inorgchem.5b00507 |
Public URL | https://durham-repository.worktribe.com/output/1414483 |
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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.inorgchem.5b00507.
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