Experimental Validation of Quantum Circuit Rules in Molecular Junctions

Elena Gorenskaia, Masnun Naher, Lakshya Daukiya, Stephen A. Moggach, David Costa Milan, Andrea Vezzoli, Colin J. Lambert, Richard J. Nichols, Thomas Becker, Paul J. Low

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A series of diarylacetylene (tolane) derivatives functionalised at the 4- and 4′-positions by thiolate, thioether, or amine groups capable of serving as anchor groups to secure the molecules within a molecular junction have been prepared and characterised. The series of compounds have a general form X-B-X, Y-B-Y, and X-B-Y where X and Y represent anchor groups and B the molecular bridge. The single-molecule conductance values determined by the scanning tunnelling microscope break-junction method are found to be in excellent agreement with the predictions made on the basis of a recently proposed 'molecular circuit law', which states 'the conductance CH21136_IE1.gif of an asymmetric molecule X-B-Y is the geometric mean CH21136_IE2.gif of the conductance of the two symmetric molecules derived from it, CH21136_IE3.gif and CH21136_IE4.gif.' The experimental verification of the circuit law, which holds for systems in which the constituent moieties X, B, and Y are weakly coupled and whose conductance takes place via off-resonance tunnelling, gives further confidence in the use of this relationship in the design of future compounds for use in molecular electronics research.

Original languageEnglish
Pages (from-to)806-818
Number of pages13
JournalAustralian Journal of Chemistry
Volume74
Issue number11
DOIs
Publication statusPublished - Dec 2021

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