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Distortion of flat ligand structure in metal complexes of porphyrins caused by N-methyl substitution considerably decreases the kinetic stability of these compounds in DMSO–HOAc proton-releasing medium ((AcO)Zn(N-Me)TPP (Ib) < (AcO)CoII(N-Me)TPP (Ia) < ZnTPP (IIb) < CoIITPP (IIa)) and their resistance to thermal destruction in crystal state {(AcO)CoII(N-Me)TPP (Ia) < (AcO)Zn(N-Me)TPP (...