Charge Transfer Complexes of Some Heterocyclic Aromatic Amines with π-Organic Acceptors in Polar Solvents

A conductometric titration technique has been used to investigate the electron transfer activity of CT molecular complexes formed by arylazopyrimidine and naphthylazopyrimidine derivatives as donors and the organic pi-acceptors p-nitroaniline, p-chloroaniline, p-bromoaniline, anthraquinone, picric acid, alpha-nitroso-beta-naphthol, p-hydroxybenzaldehyde and maleic anhydride. The study was performed at different degree of temperature and in three different polar solvents namely N,N-dimethylformamide (DMF), acetonitrile (ACN) and dimethylsulfoxide (DMSO). The stoichiometric ratios of these complexes were found to be 1:1. The dissociation constant (alpha sigma(M)) values of the formed complexes have been calculated, and the effects of solvents as well as types of electron donors on their conductance sigma(P)-values have been examined.