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Side-Group Effect on Electron Transport of Single Molecular Junctions

Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
Key Lab for Functional Materials Chemistry of Guizhou Province, School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China
Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou 310018, China
State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, Dalian University of Technology, Dalian 116024, China
Authors to whom correspondence should be addressed.
Micromachines 2018, 9(5), 234;
Received: 23 April 2018 / Revised: 9 May 2018 / Accepted: 10 May 2018 / Published: 13 May 2018
(This article belongs to the Special Issue Atomic and Molecular Junction for Molecular Electronic Devices)
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In this article, we have investigated the influence of the nitro side-group on the single molecular conductance of pyridine-based molecules by scanning tunneling microscopy break junction. Single molecular conductance of 4,4′-bipyridine (BPY), 3-nitro-4-(pyridin-4-yl)pyridine (BPY-N), and 3-nitro-4-(3-nitropyridin-4-yl)pyridine (BPY-2N) were measured by contact with Au electrodes. For the BPY molecular junction, two sets of conductance were found with values around 10−3.1 G0 (high G) and 10−3.7 G0 (low G). The addition of nitro side-group(s) onto the pyridine ring resulted in lower conductance of 10−3.8 G0 for BPY-N and 10−3.9 G0 for BPY-2N, respectively, which can be attributed to the twist angle of two pyridine rings. Moreover, the steric hindrance of nitro group(s) also affects the contacting configuration of electrode-molecule-electrode. As a consequence, only one set of conductance value was observed for BPY-N and BPY-2N. Our work clearly shows the important role of side-groups on the electron transport of single-molecule junctions. View Full-Text
Keywords: STM break junction; single-molecule conductance; twist angle; nitro group; steric hindrance STM break junction; single-molecule conductance; twist angle; nitro group; steric hindrance

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Huang, M.-L.; Zhang, F.; Wang, C.; Zheng, J.-F.; Mao, H.-L.; Xie, H.-J.; Shao, Y.; Zhou, X.-S.; Liu, J.-X.; Zhuang, J.-L. Side-Group Effect on Electron Transport of Single Molecular Junctions. Micromachines 2018, 9, 234.

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