Synthesis, electrochemistry, and single-molecule conductance of bimetallic 2,3,5,6-tetra(pyridine-2-yl)pyrazine-based complexes

R. Davidson, J.H. Liang, D. Costa Milan, B.W. Mao, R.J. Nichols, S.J. Higgins, D.S. Yufit, A. Beeby, Paul Low

Research output: Contribution to journalArticle

26 Citations (Scopus)
181 Downloads (Pure)

Abstract

© 2015 American Chemical Society. 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}(Î14-tpp){Ru(L1)}][PF6]4 ([3][PF6]4), and [{(L2)Ru}(Î14-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.
Original languageEnglish
Pages (from-to)5487-5494
JournalInorganic Chemistry
Volume54
Issue number11
Early online date14 May 2015
DOIs
Publication statusPublished - 1 Jun 2015

Fingerprint Dive into the research topics of 'Synthesis, electrochemistry, and single-molecule conductance of bimetallic 2,3,5,6-tetra(pyridine-2-yl)pyrazine-based complexes'. Together they form a unique fingerprint.

  • Cite this