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
State Key Laboratory of Physical Chemistry of Solid Surfaces , iChEM , Department of Chemical and Biochemical Engineering , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China . Email:
Department of Physics , Lancaster University , Lancaster LA1 4YB , UK . Email:
Chem Sci. 2017 Nov 1;8(11):7505-7509. doi: 10.1039/c7sc01014a. Epub 2017 Sep 7.
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.
通过单分子结的电导测量研究了具有量子干涉效应的薁衍生物的质子化。合成了三种具有不同连接性的薁衍生物,并与三氟乙酸反应形成质子化状态。发现质子化的薁分子结的电导比中性状态高出一个多数量级,而具有相消干涉的分子表现出更显著的变化。我们最近开发的无参数连接性理论支持了这些实验观察结果,该理论表明,当中性状态下费米能级附近的相消干涉通过质子化得到缓解时,电导变化最大。