24元大环双核铜配合物的合成及对超氧化物歧化酶的模拟

Synthesis of Three 24-Membered Macrocyclic Binuclear Copper (Ⅱ) Complexes and Modelling on Superoxide Dismutase

合成了三个24元大环双铜(Ⅱ)配合物作为SOD模拟物,配体由2,6-二乙酰基吡啶与3-氧杂戊烷1,5-二胺缩合而成,以SON^-,N_3^-,im^-桥联,其中前面两个桥联双铜(Ⅱ)配合物是新配合物。用多种物理方法进行了表征,并用EPR和电子光谱研究了桥基为im^-的配合物与N_3^-,SCN^-,F^-和Br^-的键合。其中N_3^-发生轴向配位,SCN^-使im^-断裂,与SOD的键合作用类似,F^-,Br^-对模拟物无明显作用。

Three 24-membered macrocyolic binuclear copper (Ⅱ) complexes for modelling Cu, Zn-SOD have been synthesized by condensation reactions of 2, 6-diacetylpyridine wish 3-oxapentane-1, 5-diamine, in which two metal centers linked via SCN^-, N^-_3 or im^- bridge. The former two of complexes are new. They have been characterized byseveral physical methods, and the binding of imidazolate bridged complex with halides, azide and thiocyanate ions has been studied by EPR and electronic spectra. Among them azide coordinates So Cu(Ⅱ) as She fifth ligand in the axial position, and thiocyanate breaks the imidazolate bridge. These results is similar to the binding of SOD. As for She binding of halide ions, chloride displaces the imidazolate bridge and fluoride, bromide have no significant effect on the model complexes.