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Synthesis, Characterization, and SOD-like Activity Testing of Two Novel Copper(II) Complexes Bridged by Oxamide-N,N'-diacetic Acid

Zhang L., Ma S. -L., Shen A.-Y., Fu M., Zhang L. -J., Liu X.

Polish Journal of Chemistry

2003

Vol. 77 / nr 7

837-844

To provide more complexes which are expected to yield better similarity to authentic SOD (Superoxide Dismutase) and to have certain SOD activity, two novel 1 D linear complexes composed of binuclear copper(II) units are synthesized and characterized with the structural units bridged by oxamide-N,N_-diacetic acid. They are {Na[Cu2(oxaa)OAc]_H2O}n (I) and {Na[Cu2(oxaa)(o-phenylenediamine)2OAc]_2.5H2O}n (II), where oxaa denotes oxamide-N,N_-diacetic acid tetraanion. The temperature dependence of the magnetic susceptibilities of {Na[Cu2(oxaa)(o-phenylenediamine)2OAc]_2.5H2O}n was investigated between 4.99-299 K, giving the exchange parameter J = -294.1 cm-1. This result is demonstrated with an antiferromagnetic interaction between the adjacent copper(II) centers. In addition, the SOD-like activity of the complex (II) is discussed.