On the Mechanism of the Metal Exchange in Natural Cadmium Porphyrins

摘要

The kinetics of the exchange of the Cd~(2+) ions in the complexes with the natural protogroup porphyrins (protoporphyrin, mesoporphyrin, deuteroporphyrin, and hematoporphyrin) for the Zn~(2+) ions is studied. The stoichiometric ratios of components in the reaction of cadmium exchange for zinc in acetonitrile and DMSO are established. The results obtained are compared with the previously published data for the reaction with the Co~(2+) ions. The activation mechanism of the metal exchange reaction is considered, depending on the effect of the nature of substituents in porphyrin, d-metal ions, and a solvent.