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The metal exchange reactions of cadmium 5 monoaza 2, 3,7,8,12,13,17,18 octamethylporphyri nate with CuCl 2 and ZnCl 2 in dimethyl sulfoxide (DMSO) were studied by spectrophotometry. The kinetic and energy parameters of the metal exchange reaction were determined. The possible stoichiometric mech anism of the metal exchange reaction was proposed. A comparative analysis of the reaction rate constants obtained for the metal exchange and for the complex formation of 5 monoaza 2,3,7,8,12,13,17,18 octame thylporphyrin with the same salts in DMSO was performed.

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