Citation: Xiao-Qin WEI, Zhuan GAO, Fan REN, Xiao-You CUI, Yue ZHOU, Dong SHAO. A Halogen Hydrogen-Bonded Fe(Ⅲ) Complex Showing Hysteretic Spin-Crossover Behavior above Room Temperature[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(11): 2283-2290. doi: 10.11862/CJIC.2022.235 shu

A Halogen Hydrogen-Bonded Fe(Ⅲ) Complex Showing Hysteretic Spin-Crossover Behavior above Room Temperature

  • Corresponding author: Dong SHAO, shaodong@nju.edu.cn
  • Received Date: 6 April 2022
    Revised Date: 19 September 2022

Figures(7)

  • A mononuclear Fe(Ⅲ) complex, [Fe(bzimpy-1H)2]Cl (1) was prepared by the reaction of a tridentate ligand 2, 6-bis(benzimidazol-2-yl)pyridine (bzimpy), where bzimpy-1H is the product of bzimpy after removing one proton, and its structure and magnetic properties were characterized in detail. The single crystal structure analysis shows that the Fe3+ center features a rare distorted octahedral N6 coordination environment for the complex, and the 3D supramolecular structure is constructed by N—H⋯Cl hydrogen bonding between the adjacent cation complex units and counterbalance chloride ions. The complex showed hysteretic spin-crossover (SCO) behavior above room temperature as evidenced by combined magnetic investigations and differential scanning calorimetry measurements (T1/2↑=345 K, T1/2 ↓=330 K). In addition, the light-induced excited spin state trapping (LIESST) effect was also observed in the complex. The magnetism-structure relationship shows that the N—H⋯Cl hydrogen bonding plays an important role in the bistable SCO behavior of the complex.
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