Metal-exchange reaction for complexes with macrocyclic ligands refers to a special type of complex coordination interactions. The reaction of metal exchange has founded wide application for the synthesis of complexes of natural and synthetic porphyrins. In the general form, the metal-exchange reaction may be written as follows:
MР + M/Xn(Solv)m-n M/Р + MXn(Solv)m-n
where МP and M/P are metalloporphyrins, M/Xn(Solv)m-n are metal salts of solvate com-plexes. Cd-octa(4-methoxyphenyl)porphyrin was obtained by the reaction of octa(4-methoxyphenyl)-porphyrin-ligand with cadmium chloride in the presence of potassium ace-tate in dime-thylformamide. The obtained compound was identified by the methods of UV-VIS spectroscopy, 1H NMR and mass-spectrometry. The reaction order on the salt and the complex of cadmium in the case of the reactions of the Cd-octa(4-methoxyphenyl)porphyrin metal-exchange with tin chloride in dimethylformamide is equal to 1. Thus, the metal-exchange reaction is bimolecular and its total rate obeys to the second-order kinetic equa-tion. It is suggested that the metal-exchange reaction of Cd-оcta(4-methoxyphenyl)porphyrin with tin chloride in dimethyl-formamide proceeds through a bimolecular associative mecha-nism.

Key words: metal exchange reaction, cadmium octa(4-methoxyphenyl)porphyrinate, tin octa(4-methoxyphenyl)porphyrinate, electron adsorption spectra

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