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Hard and soft porphyrins: equilibrium constants for Cd2+ and Pb2+ with water-soluble free base porphyrins
Preview AbstractEquilibrium constants (1:1) for the reactions of cadmium(II) and lead(II) with water-soluble free base porphyrins of differing basicities (pK3) are reported. Soft porphyrins with low pK3 values favor the softer Cd(II), while harder porphyrins with higher pK3 values have more affinity for the relatively harder Pb(II) ion.