摘要
Understanding the quantum effect in the cross-conjugated system is of fundamental significance in molecular electronics.In this study,four molecules Xa-O,Xa,BP and BP-O were synthesized to investigate the destructive quantum interference(DQI)of a carbonyl bridge.The single-molecule conductance measured by the scanning tunneling microscope break junction(STM-BJ)technique demonstrates an increase in the conductance from molecule BP-O to molecule Xa-O as the cross-conjugated system is extended.Theoretical calculations show that the explicit DQI feature is presented in BP-O but absent in Xa-O,which indicates the removal of DQI in the restrained structures and results in the conductance enhancement in Xa-O.
基金
National Natural Science Foundation of China(No.92061117)
Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB20000000)
Project of the Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(No.2021ZR129)
Natural Science Foundation of Fujian Province,China(No.2020J01110).
