Studies on the Charge-transfer Complexes of 2,6-Dichloro-p-benzoquinone with Phenols

Abstract

The molecular complexes of 2,6-dichloro-p-benzoquinone with phenol and cresols have been studied using electronic absorption spectroscopy in carbon tetrachloride medium under high donor concentrations at different temperatures. All the complexes exhibit one charge transfer band each in the wavelengths region where acceptor and donor do not have any absorption. All the complexes are inferred to be of the π-π type with the 1 : 1 stoichiometry and have R_y configuration. The stability constants and thermodynamic parameters of the charge transfer complexes have been evaluated from the position of the CT bands. Further, the attempts have been made to determine the ionization potentials of the donors from the energies of the CT bands.