Regulating a Benzodifuran Single Molecule Redox Switch via Electrochemical Gating and Optimization of Molecule/Electrode Coupling

Li, Zhihai; Li, Hui; Chen, Songjie; Froehlich, Toni; Yi, Chenyi; Schönenberger, Christian; Calame, Michel; Decurtins, Silvio; Liu, Shi-Xia; Borguet, Eric (2014). Regulating a Benzodifuran Single Molecule Redox Switch via Electrochemical Gating and Optimization of Molecule/Electrode Coupling. Journal of the American Chemical Society, 136(25), pp. 8867-8870. American Chemical Society 10.1021/ja5034606

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We report a novel strategy for the regulation of charge transport through single molecule junctions via the combination of external stimuli of electrode potential, internal modulation of molecular structures, and optimization of anchoring groups. We have designed redox-active benzodifuran (BDF) compounds as functional electronic units to fabricate metal–molecule–metal (m–M–m) junction devices by scanning tunneling microscopy (STM) and mechanically controllable break junctions (MCBJ). The conductance of thiol-terminated BDF can be tuned by changing the electrode potentials showing clearly an off/on/off single molecule redox switching effect. To optimize the response, a BDF molecule tailored with carbodithioate (−CS2–) anchoring groups was synthesized. Our studies show that replacement of thiol by carbodithioate not only enhances the junction conductance but also substantially improves the switching effect by enhancing the on/off ratio from 2.5 to 8.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Li, Zhihai; Li, Hui; Chen, Songjie; Yi, Chenyi; Decurtins, Silvio and Liu, Shi-Xia

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

0002-7863

Publisher:

American Chemical Society

Language:

English

Submitter:

Silvio Decurtins

Date Deposited:

25 Mar 2015 16:31

Last Modified:

26 Aug 2015 13:19

Publisher DOI:

10.1021/ja5034606

BORIS DOI:

10.7892/boris.65804

URI:

https://boris.unibe.ch/id/eprint/65804

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