Solvent Effects on Charge-Transfer Complexes in Solid Solutions

Abstract

Abstract Electrical and optical properties of a great variety of charge transfer complexes (CT) of organic compounds have been investigated in the recent years. The interest in this area is evidenced by large number of reviews and original reports. The studies of dark conductivity and photoconductivity have been recently extended to polymers acting as donors or acceptors, although more papers are related to the systems in which either the donor or acceptor consists of a low molecular weight species. Some studies have been carried out .in which CT-complexes of polymeric species have been compared with the low molecular weight homologs. Little difference was found between these two types of complexes. The equilibrium constants of CT-complexes formation as determined from spectrophotometric studies, for polymeric species and for monomeric molecules were higher for the monomer than for the polymer (e.g. Refs 1-5). The charge transfer bands exhibited by the polymeric complexes did not always coincide with thos...