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

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  • Guogang Yang
  • Sara Sangtarash
  • Zitong Liu
  • Xiaohui Li
  • Hatef Sadeghi
  • Zhibing Tan
  • Ruihao Li
  • Jueting Zheng
  • Xiaobiao Dong
  • Junyang Liu
  • Yang Yang
  • Jia Shi
  • Zongyuan Xiao
  • Guanxin Zhang
  • Colin Lambert
  • Wenjing Hong
  • Deqing Zhang
<mark>Journal publication date</mark>1/11/2017
<mark>Journal</mark>Chemical Science
Issue number11
Number of pages5
Pages (from-to)7505-7509
Publication StatusPublished
Early online date7/09/17
<mark>Original language</mark>English


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.