Protonation tuning of quantum interference in azulene-type single-molecule junctions

The protonation of azulene derivatives with quantum interference effects is studied by the conductance measurements of single-molecule junctions. Three azulene derivatives with different connectivities are synthesized and reacted with trifluoroacetic acid to form the protonated states. It is found t...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2017, Vol.8 (11), p.7505-7509
Main Authors: Yang, Guogang, Sangtarash, Sara, Liu, Zitong, Li, Xiaohui, Sadeghi, Hatef, Tan, Zhibing, Li, Ruihao, Zheng, Jueting, Dong, Xiaobiao, Liu, Junyang, Yang, Yang, Shi, Jia, Xiao, Zongyuan, Zhang, Guanxin, Lambert, Colin, Hong, Wenjing, Zhang, Deqing
Format: Article
Language:English
Subjects:
Azulene
Chemical synthesis
Derivatives
Interference
Protonation
Quantum interference effects
Resistance
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Summary:The protonation of azulene derivatives with quantum interference effects is studied by the conductance measurements of single-molecule junctions. Three azulene derivatives with different connectivities are synthesized and reacted with trifluoroacetic acid to form the protonated states. It is found that the protonated azulene molecular junctions produce more than one order of magnitude higher conductance than the neutral states, while the molecules with destructive interference show more significant changes. These experimental observations are supported by our recently-developed parameter free theory of connectivity, which suggests that the largest conductance change occurs when destructive interference near the Fermi energy in the neutral state is alleviated by protonation.
ISSN:2041-6520
2041-6539
DOI:10.1039/c7sc01014a