Structure-property relationships in redox-gated single molecule junctions - A comparison of pyrrolo-tetrathiafulvalene and viologen redox groups

E. Leary, S.J. Higgins, H. van Zalinge, W. Haiss, Richard John Nichols, Sune Nygaard, Jan Oskar Jeppesen, Jens Ulstrup

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We demonstrate that the electrical 'switching" behavior of single molecules connected between two electrode contacts can be controlled by altering their structure and electrochemical characteristics. The electrical properties of gold vertical bar molecule vertical bar gold single molecule junctions incorporating HS(CH2)(6)-X-(CH2)(6)SH, where X = viologen (4,4'-bipyridinium) or pyrrolotetrathiafulvalene, are determined using a scanning tunneling microscopy based technique. The switching behavior, controlled through a tuneable electrochemical gate, changes from an on-off response (viologen) to an off-on-off response (pyrrolotetrathiafulvalene) on changing the central redox group. In contrast, the electrical properties of junctions incorporating redox-inactive HS(CH2)(6)-1,4-C6H4-(CH2)(6)SH do not alter significantly as a function of applied potential.
Original languageEnglish
JournalJournal of the American Chemical Society
Volume130
Issue number37
Pages (from-to)12204
ISSN0002-7863
DOIs
Publication statusPublished - 2008

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