电导
化学
分子
质子化
脱质子化
干扰(通信)
断开连接
量子
化学物理
计算化学
量子力学
凝聚态物理
有机化学
物理
离子
电气工程
频道(广播)
工程类
作者
Yu‐Peng Zhang,Lichuan Chen,Zeqi Zhang,Jingjing Cao,Chun Tang,Junyang Liu,Linlin Duan,Yong Huo,Xiangfeng Shao,Wenjing Hong,Hao‐Li Zhang
摘要
Distinguishing structural isomers at the single-molecule level remains a challenge. We report the single-molecule recognition of two diketopyrrolopyrrole containing isomers (SDPP and SPPO) employing the mechanically controllable break junction technique. The single-molecule conductances of the two isomers are indistinguishable under normal conditions. However, reversible protonation and deprotonation of the SPPO in molecular junction result in more than 1 order of magnitude conductance change, which dramatically enhances the conductance difference between the two isomers. Theoretical study reveals that the dramatic conductance switching is due to reversible quantum interference effect. It is suggested that combination of stimuli-response and quantum interference can be an efficient strategy to enhance isomer recognition and conductance switching in single-molecule junctions.
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