Polyhedron p. 69 - 76 (2015)
Update date:2022-08-29
Topics:
Feng, Xiao Dong
Zhang, Rui
Wang, Xin Yu
Zhang, Xiao Xi
Wang, Ji Xiao
Xing, Yong Heng
Sun, Li Xian
Copper complexes [Cu2(μ2-C2O4)(HC2O4)(L1)]·(H2C2O4) (1), [Cu2(Bpz?T-OEt)2Cl2CuCl4] (Bpz?T-EtOH = L2) (2) and [Cu2(Bpz?T-O)4]·4pz?·4H2O (3) (Bpz?T-O = L3) (L1 = 2,4-bis(3,5-dimethyl-1H-pyrazol-1-yl)-6-diethylamino-1,3,5-triazine, Bpz?T = 2,4,6-tri(3,5-dimethylpyrazol-1-yl)-1,3,5-triazine) have been synthesized in the reaction of Cu(Ac)2·2H2O, oxalic acid, L1 (for 1) or Bpz?T (for 2 and 3) and CuCl2·2H2O with solution methods. They were characterized by elemental analysis, IR, UV-Vis and thermogravimetric analyses (TG), and the single-crystal X-ray diffraction analysis. Structural analysis reveals that center metal Cu atoms in the complexes 1 and 3 are six-coordination modes, forming distorted octahedron geometries with N2, O2 and N6 donors, respectively. While Cu atom in the complex 2 is four-coordination and five-coordination modes, forming tetragonal pyramid and tetrahedron geometry with N3 Cl2 and N6, respectively. The complexes exhibit catalytic bromination activity in a single-pot reaction of the conversion of phenol red to bromophenol blue in a mixed system of H2O-DMF-KBr at the constant temperature of 30 ± 0.5 °C with a buffer solution of NaH2PO4-Na2HPO4 (pH 5.8), indicating that they can be considered as a potential functional model of bromoperoxidase.
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