Abstract
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.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No.92061117), the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB20000000), the Project of the Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China(No.2021ZR129) and the Natural Science Foundation of Fujian Province, China(No.2020J01110).
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Qu, K., Pan, ZY., Wang, JY. et al. Removing the Destructive Quantum Interference in Cross Conjugation System by Structural Restraint. Chem. Res. Chin. Univ. 39, 224–227 (2023). https://doi.org/10.1007/s40242-022-2136-4
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DOI: https://doi.org/10.1007/s40242-022-2136-4