الفهرس 
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Abstract
Metal complexes play a variety of important roles in biological systems specially transition metal complexes which are sources of active radical species in biological and chemical systems current results in the development of cobalt complexes as sources of active radical species and their application as bioactive are out line [1] also catalytic activity of cobalt complexes of the B12 series in autoxidation of ascorbic acid and generation of active oxygen species in the course of the process were examined as a chemical model of their potential biological effectes including antitumors ones 1.