Simplifying the conductance profiles of molecular junctions: the use of the trimethylsilylethynyl moiety as a molecule–gold contact

Santiago Marqués-González; Dmitry S. Yufit; Judith A. K. Howard; Santiago Martín; Henrry M. Osorio; Víctor M. García-Suárez; Richard J. Nichols; Simon J. Higgins; Pilar Cea; Paul J. Low

doi:10.1039/C2DT31825C

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Dalton Transactions

Issue 2, 2013

The international journal for inorganic, organometallic and bioinorganic chemistry

Impact Factor 3.838 48 Issues per Year Indexed in MEDLINE

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Simplifying the conductance profiles of molecular junctions: the use of the trimethylsilylethynyl moiety as a molecule–gold contact

Santiago Marqués-González,^a Dmitry S. Yufit,^a Judith A. K. Howard,^a Santiago Martín,*^b^c Henrry M. Osorio,^d Víctor M. García-Suárez,^e Richard J. Nichols,^f Simon J. Higgins,^f Pilar Cea^c^d and Paul J. Low*^a

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Corresponding authors

Department of Chemistry and Centre for Molecular and Nanoscale Electronics, Durham University, Durham, UK
E-mail: p.j.low@durham.ac.uk ;
Fax: +44 (0)191 384 4737 ;
Tel: +44 (0)191 334 2114

Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC, Departamento de Física de la Materia Condensada, 50009 Zaragoza, Spain
E-mail: smartins@unizar.es

Laboratorio de Microscopías Avanzadas (LMA) C/Mariano Esquilor s/n Campus Rio Ebro, Zaragoza, Spain

Instituto de Nanociencia de Aragón (INA) and Departamento de Química Física, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain

Nanomaterials and Nanotechnology Research Center (CINN), University of Oviedo-CSIC, Departamento de Física, Oviedo, Spain

Department of Chemistry, University of Liverpool, Liverpool, UK

Dalton Trans., 2013,42, 338-341

DOI: 10.1039/C2DT31825C
Received 10 Aug 2012, Accepted 09 Oct 2012
First published online 29 Oct 2012

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Conductance across a metal|molecule|metal junction is strongly influenced by the molecule–substrate contacts, and for a given molecular structure, multiple conductance values are frequently observed and ascribed to distinct binding modes of the contact at each of the molecular termini. Conjugated molecules containing a trimethylsilylethynyl terminus, –C [triple bond, length as m-dash] CSiMe₃ give exclusively a single conductance value in I(s) measurements on gold substrates, the value of which is similar to that observed for the same molecular backbone with thiol and amine based contacting groups when bound to under-coordinated surface sites.