Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 25, Pages 8867-8870Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja5034606
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Funding
- National Science Foundation [CHE 0809838]
- Swiss National Science Foundation [200021-147143]
- Sino Swiss Science and Technology Cooperation
- European Commission (EC) FP7 ITN MOLESCO Project [606728]
- EC FP7 STREP SYMONE Project [318597]
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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.
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