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Single-Molecule Conductance Studies of Organometallic Complexes Bearing 3-Thienyl Contacting Groups

Research output: Contribution to journalJournal article

Published
  • Soren Bock
  • Oday A. Al-Owaedi
  • Samantha G. Eaves
  • David C. Milan
  • Mario Lemmer
  • Brian W. Skelton
  • Henrry M. Osorio
  • Richard J. Nichols
  • Simon J. Higgins
  • Pilar Cea
  • Nicholas J. Long
  • Tim Albrecht
  • Santiago Martin
  • Colin J. Lambert
  • Paul J. Low
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<mark>Journal publication date</mark>02/2017
<mark>Journal</mark>Chemistry - A European Journal
Issue number9
Volume23
Number of pages11
Pages (from-to)2133-2143
Publication statusPublished
Early online date16/01/17
Original languageEnglish

Abstract

The compounds and complexes 1,4-C6H4(C Ccyclo-3-C4H3S)(2) (2), trans-[Pt(C C-cyclo-3-C4H3S)(2)(PEt3)(2)] (3), trans- Ru(C C-cyclo-3-C4H3S)(2)(dppe)(2)] (4) dppe = 1,2-bis(diphenylphosphino) ethane) and trans-[Ru(C C-cyclo-3C(4)H(3)S) (2){P(OEt)(3)}(4)] (5) featuring the 3-thienyl moiety as a surface contacting group for gold electrodes have been prepared, crystallographically characterised in the case of 3-5 and studied in metal | molecule | metal junctions by using both scanning tunnelling microscope break-junction (STM-BJ) and STM-I(s) methods (measuring the tunnelling current (I) as a function of distance (s)). The compounds exhibit similar conductance profiles, with a low conductance feature being more readily identified by STM-I(s) methods, and a higher feature by the STM-BJ method. The lower conductance feature was further characterised by analysis using an unsupervised, automated multi-parameter vector classification (MPVC) of the conductance traces. The combination of similarly structured HOMOs and non-resonant tunnelling mechanism accounts for the remarkably similar conductance values across the chemically distinct members of the family 2-5.