Some donor-acceptor complexes of silicon phthalocyanine dianions

Abstract

Studying the reaction of PcSiX2 (X = Cl, OH) with KOH in DMSO we first discovered red D-A complexes [(Pc2−)·PcSiX2] and [(Pc2−)·O2] in which silicon phthalocyanine dianion Pc2− is a donor, and the parent phthalocyanine silicon or oxygen are acceptors of electron density. The complexes were characterized by electron absorption, NMR, and ESR spectra. In the reactions with Me3SiCl, H2O, or CH3COOH the complexes regenerate phthalocyanine and O2. In O2 atmosphere the [(Pc2−)·O2] complex gradually degrades affording a product of unknown nature.