Aggregation and photophysical properties of phthalocyanines in supramolecular complexes

The concentration dependence of the degree of association of zinc and aluminum phthalocyanines in supramolecular systems is determined. Complexes containing rare photoactive associates with an absorption maximum significantly shifted to longer wavelengths are obtained. The radiative lifetimes, extinction coefficients, and energy of HOMO-LUMO electronic transitions of isolated and associated metal phthalocyanine complexes are determined. It is demonstrated that the existence of the metal phthalocyanine largely in an aggregated state is characteristic of zinc phthalocyanine systems, while aluminum phthalocyanine, having an additional extraligand, chloride ion, is stabilized in the isolated state.