Effects of ionenes on structure and catalytic activity of cobaltphthalocyanine, 5. The catalytic role of cobaltphthalocyanine aggregates

The interaction of several ionenes with tetrasodium phthalocyaninatocobalttetrasulfonate ( 1 ) was investigated spectrophotometrically, both in the unreduced and reduced state. The 2,10‐ and 2,12‐ionenes 2d , e appeared to induce monomerization of the phthalocyanine moiety, especially of the reduced form which is ascribed to hydrophobic effects. All other ionenes studied strongly induced aggregation of the cobalt complex. Kinetic thiol oxidation experiments revealed large differences between the macromolecular effects of the hydrophobic 2,10‐ionene 2d and the hydrophilic ionenes. These phenomena are explained by the different catalytic activity of phthalocyanine in its monomeric and aggregated form.