Synthesis, characterization and comparative electrochemistry of beta and alpha tetra-[4-oxy-3-methoxybenzoic acid]-substituted Zn(II), Co(II) and Cu(II) phthalocyanines

The complexes were observed to display metal- and/or phthalocyanine ring-based redox processes. The redox and aggregation behaviours of the phthalocyanine complexes were found to be affected considerably by the nature of the substitution.