Correlation of breaking forces, conductances and geometries of molecular junctions.
- Yoshida K Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
- Pobelov IV Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
- Manrique DZ Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom.
- Pope T Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom.
- Mészáros G 1] Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland [2] Research Centre for Natural Sciences, HAS, Magyar tudósok krt. 2, H-1117 Budapest, Hungary.
- Gulcur M Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, United Kingdom.
- Bryce MR Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, United Kingdom.
- Lambert CJ Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom.
- Wandlowski T Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
- 2015-03-12
Published in:
- Scientific reports. - 2015
English
Electrical and mechanical properties of elongated gold-molecule-gold junctions formed by tolane-type molecules with different anchoring groups (pyridyl, thiol, amine, nitrile and dihydrobenzothiophene) were studied in current-sensing force spectroscopy experiments and density functional simulations. Correlations between forces, conductances and junction geometries demonstrate that aromatic tolanes bind between electrodes as single molecules or as weakly-conductive dimers held by mechanically-weak π - π stacking. In contrast with the other anchors that form only S-Au or N-Au bonds, the pyridyl ring also forms a highly-conductive cofacial link to the gold surface. Binding of multiple molecules creates junctions with higher conductances and mechanical strengths than the single-molecule ones.
- Language
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- English
- Open access status
- gold
- Identifiers
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- DOI 10.1038/srep09002
- PMID 25758349
- Persistent URL
- https://sonar.ch/global/documents/140294
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