Spectroscopic studies of charge-transfer complexes of 2,3-dichloro-5,6-dicyano-p-benzo-quinone

Charge-transfer complexes of 2,3-dichloro-5, 6-dicyano-p-benzoquinone (DDQ) p-acetotoluidide, acetanilid, biphenyl and naphthalene were studied and th eir absorption spectra in solution were recorded. Absorption spectral data were obtained in CH2Cl2, CHCl3, CCl4 and mixture (CH2Cl2 + v) at differ ent temperatures. Two charge-transfer bands were observed in each case. Spectr al characterization of these complexes was determined and correlated with t he ionization potential of the donor. Variation in thermodynamic parameters were also found to be due to change in donor and solvent.