Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (2): 245-251.DOI: 10.19894/j.issn.1000-0518.220185

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Synthesis and Photochromic Properties of Two Isostructural Viologen Coordination Polymers

Jin-Jian LIU1,2(), Na LIU1, Feng-Yi YANG1   

  1. 1.School of Chemistry and Material Science,Shanxi Normal University,Taiyuan 030031,China
    2.Modern College of Humanities and Science,Shanxi Normal University,Linfen 041000,China
  • Received:2022-05-19 Accepted:2022-11-15 Published:2023-02-01 Online:2023-02-27
  • Contact: Jin-Jian LIU
  • About
  • Supported by:
    the Natural Science Foundation of Shanxi Province(20210302124260);the Graduate Education Innovation Project of Shanxi Normal University(2021XSY039)


As a new type of smart material, chromic materials have great applications in the fields of optical storage information and optical devices. Self-assembly of transition metal ions Mn2+ and Cd2+ with a viologen ligand, 1,1′-bis(4-carboxybenzyl)-4,4′-bipyridinium dichloride (H2BpybcCl2) with flexible backbone, forms two novel isostructural coordination polymers, [Mn(Bpybc)Cl2·H2O] n (1) and [Cd(Bpybc)Cl2·4H2O] n (2). X-ray single-crystal diffraction shows that two compounds are one-dimensional chain structures. Both compounds exhibit obvious photochromic behaviors under UV irradiation, which is caused by photo-induced electron transfer to generate viologen free radicals.

Key words: Viologens, Coordination polymers, Crystal structure, Photochromism, Electron transfer

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