Synthesis and properties of asymmetricly substituted Mn(III)-nitro-phenylporphirins

Abstract

Mn(III)-5-(4-nitrophenyl)-10,15,20-triphenylporphyrin and Mn(III)-5,10,15-tri-(4-nitrophenyl)-20-phenylporphyrin were synthesized using the reactions of complex formation of corresponding porphyrins and metal exchange of their Cd complexes with MnCl2 in dimethylformamide. Partial reduction of Mn(III) to Mn(II) is observed upon dissolution of manganese(III) complexes in dimethylformamide. When NaOH solid is added to a solution of dimethylformamide and in ethanolamine unstable Mn(II) porphyrins are formed. The photochemical stability and oxidative degradation of Mn(III)-porphyrins have been studied. The metal exchange reaction of asymmetricaly substituted Cd(II)-porphyrins with manganese chloride in dimethylformamide has been studied. The kinetic parameters of the reaction were calculated. The influence of substituends and the nature of the salt on the kinetic parameters of the metal exchange reaction was revealed. The synthesized compounds were identified by methods UV-Vis, IR, 1H NMR spectroscopy and mass spectrometry.