Three-state single-molecule naphthalenediimide switch:integration of a pendant redox unit for conductance tuning

Li, Yonghai and Baghernejad, Masoud and Al Galiby, Qusiy and Manrique, David Zsolt and Zhang, Guanxin and Hamill, Joseph and Fu, Yongchun and Broekmann, Peter and Hong, Wenjing and Wandlowski, Thomas and Zhang, Deqing and Lambert, Colin (2015) Three-state single-molecule naphthalenediimide switch:integration of a pendant redox unit for conductance tuning. Angewandte Chemie International Edition, 54 (46). pp. 13586-13589. ISSN 1433-7851

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Abstract

We studied charge transport through core-substituted naphthalenediimide (NDI) single-molecule junctions using the electrochemical STM-based break-junction technique in combination with DFT calculations. Conductance switching among three well-defined states was demonstrated by electrochemically controlling the redox state of the pendent diimide unit of the molecule in an ionic liquid. The electrical conductances of the dianion and neutral states differ by more than one order of magnitude. The potential-dependence of the charge-transport characteristics of the NDI molecules was confirmed by DFT calculations, which account for electrochemical double-layer effects on the conductance of the NDI junctions. This study suggests that integration of a pendant redox unit with strong coupling to a molecular backbone enables the tuning of charge transport through single-molecule devices by controlling their redox states.

Item Type:
Journal Article
Journal or Publication Title:
Angewandte Chemie International Edition
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1500/1503
Subjects:
ID Code:
84460
Deposited By:
Deposited On:
30 Jan 2017 16:10
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Aug 2020 02:49