Mn(II,III)-and Cd(II)-complexes of 5-mononitro-2,3,7,8,12,13,17,18-octaethylporphyrin, 5,15-dinitrooctaethylporphyrin, 5,10,15-trinitro-2,3,7,8,12,13,17,18-octaethylporphyrin and 5,10,15,20-tetranitro2,3,7,8,12,13,17,18-octaethylporphyrin have been synthesized and identified. A comparative study of the coordination reactions of the corresponding porphyrin ligands with manganese (II) chloride and metal exchange of their cadmium complexes with manganese (II) chloride in dimethylformamide was carried out to find the optimal conditions for the synthesis of Mn(II, III)-porphyrins. The obtained compounds were identified by UV-vis, 1 H NMR spectroscopy and mass spectrometry. The structural parameters of the synthesized compounds were calculated by the DFT method and their NBO analysis was carried out. The electrochemical properties of the synthesized manganese complexes were studied by the cyclic voltammetry method. It is shown that nitro substitution determines Mn-porphyrin redox state.
