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The composition of products and the general regularities of complex formation of meso-tetraphenylporphine with Si(IV), Ge(IV), Sn(II), and Pb(II), as well as the kinetics and mechanism of dissociation of the resulting complexes under the action of proton-donor reagents were studied. The nature of chemical and steric factors that operate to stabilize mixed-ligand acido porphyrin p-metal complexes was...