Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (7): 20240063.doi: 10.7503/cjcu20240063

• Article: Inorganic Chemistry • Previous Articles     Next Articles

Synthesis, Crystal Structure and Catecholase Activity of Copper(II) Complexes with NNN⁃Tridentate Schiff Base Ligand

BAI Yize, LIU Ruiduan, LU Qiuran, ZHAO Haiyan()   

  1. School of Sciences,Hebei University of Science and Technology,Shijiazhuang 050018,China
  • Received:2024-02-02 Online:2024-07-10 Published:2024-04-19
  • Contact: ZHAO Haiyan E-mail:hbhaiyanzh@163.com
  • Supported by:
    the Key Project of Hebei Natural Science Foundation, China(B2020208095);the Hebei Province College Students Innovation and Entrepreneurship Training Program, China(S202210082043)

Abstract:

Four complexes, [Cu(L1)Cl2](1), [Cu(L1)(SCN)2](2), [Cu(L1)bpy](ClO42·CH3OH(3) and [Cu(L2)bpy](ClO42(4), were synthesized via the reaction of the NNN-tridentate Schiff base ligands, 2-[(1H-benzimidazol-2-yl-ethylimino)-methyl]pyridine(L1) or 2-[(1H-benzimidazol-2-yl-propylimino)-methyl]pyridine(L2) with Cu(II) salts(where bpy=2,2′-bipyridine). The complexes were characterized by means of elemental analysis, infrared spectroscopy, powder X-ray diffraction, single-crystal X-ray diffraction, thermal gravimetric analysis and cyclic voltammetry. In the solid state, complexes 1~4 are mononuclear Cu(II) complexes and the Cu(II) ions exhibit distorted square pyramidal coordination geometry with τ values ranging from 0.088 to 0.340. Catecholase activity of the complexes has been studied using 3,5-di-tertbutyl catechol(3,5-DTBC) as model substrate, and kinetic parameters were calculated using the Michaelis-Menten model and Lineweaver-Burk plot. The results demonstrate that all complexes exhibit catecholase activity, with the catechol oxidation rates following the order of 2>3≈4>1. The oxidation rates depend on the distortion of the Cu(II) coordination environment, the bond lengths of the leaving group of Cu(II) ions and the steric hindrance of the complexes.

Key words: Schiff base, Cu(II) complex, Crystal structure, Catecholase activity

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