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Enhancing single-molecule conductance of platinum(II) complexes through synergistic aromaticity-assisted structural asymmetry

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Abstract

Seeking the strategies of designing highly conductive molecular structures is one of the core researches in molecular electronics. As asymmetric structure has manifested feasible properties in comprehensive fields, we introduce the structures of asymmetric platinum(II) complexes into the charge transport study at single-molecule scale for the first time. The single-molecule conductance measurement results reveal that, in platinum(II)-aryloligoynyl structures, the conductance of asymmetrically coordinated complexes is obviously higher than that of the symmetric isomers with the same molecular length, while the conductance is almost identical in symmetric and asymmetric platinum(II)-oligoynyl complexes Theoretical study uncovers that, upon connecting to the oligoynyl structure, the aromatic group effectively extends the π-system of the whole conductive backbone and gathers the HOMO population mainly on the longer oligoynyl ligand, which reduces the energy barrier in electron transport and enhances the conductance through HOMO energy lifting. This result provides feasible strategy for achieving high conductive molecular devices.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21601182, U1405252, 21531008, 21673195, 21703188, 31871877, 21933012), the National Key Research and Development Program of China (2014CB845603, 2017YFA0204902), the CAS/SAFEA International Partnership Program for Creative Research Teams, the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB20000000) and China Postdoctoral Science Foundation (2017M622060).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China

    Ping Duan, Jin-Yun Wang, Kai Qu, Qian-Chong Zhang & Zhong-Ning Chen

  2. State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), NEL, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China

    Junyang Liu, Shuning Cai, Fei Wang, Lichuan Chen, Xiaoyan Huang, Ruihao Li, Jia Shi & Wenjing Hong

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  1. Ping Duan
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  2. Junyang Liu
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  3. Jin-Yun Wang
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Correspondence to Qian-Chong Zhang, Wenjing Hong or Zhong-Ning Chen.

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Duan, P., Liu, J., Wang, JY. et al. Enhancing single-molecule conductance of platinum(II) complexes through synergistic aromaticity-assisted structural asymmetry. Sci. China Chem. 63, 467–474 (2020). https://doi.org/10.1007/s11426-019-9692-3

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