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Side-Group Effect on Electron Transport of Single Molecular Junctions

1
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
2
Key Lab for Functional Materials Chemistry of Guizhou Province, School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China
3
Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou 310018, China
4
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; https://doi.org/10.3390/mi9050234
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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Abstract

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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