ChemInform Abstract: Acidity and Dimerization of Three Water-Soluble Iron(III) Porphyrin Cations: (meso-α,β,α,β-Tetrakis(o-(N-methylnicotinamido)phenyl)por# phyrinato)iron(III), (meso-α,α,α,α-Tetrakis(o-(N-methylnicotinamido)phenyl)p# orphyrinato)iron(III), and (meso-Tetrakis(1-methylpyridinium-4-yl)porphyrinato)iron(III).
Abstract
Acidity data for the monomeric diaquo title porphyrins having both sides of the macrocyclic plane restricted toward further coordination (substituents in α- and β-position) or one face restricted (substituents only in α-position) or having both faces open toward coordination by a fifth and sixth ligand are determined by spectrophotometric titration.
ChemInform Abstract
Acidity data for the monomeric diaquo title porphyrins having both sides of the macrocyclic plane restricted toward further coordination (substituents in α- and β-position) or one face restricted (substituents only in α-position) or having both faces open toward coordination by a fifth and sixth ligand are determined by spectrophotometric titration. The dimerization constant for equilibria of the aquo-hydroxo complex monomer and the μ-oxo dimer and the kinetics of the hydrolysis of the dimers of tetrakis(1-methylpyridinium-4-yl)porphyrin at pH 1.38-10.48 and of α4-tetrakis(o-(N-methylnicotinamido)phenyl)porphyrin at pH 2.05-5.3 are studied.
