Solvent dependence of phthalocyanine redox equilibria

Abstract

The phthalocyanines and porphyrins represent a unique series of complexes which can be varied almost inexhaustively via change of substituent, metal ion, axial ligand, spin state and coordination number, yet retain the basic MN4 unit. Detailed analysis of the variation of redox equilibria with each of these factors provides rare insights into the nature of metal ligand binding. Such data are therefore of fundamental value in the development of coordination chemistry, and in the elucidation of the redox (electron transfer, oxygen binding) roles played by metal ions in biological systems.