The charge transfer complexes (CTC) formed from N-substituted phenothiazines with 2,3-dichloro-5,6-dicyanobenzoquione (DDQ ) in 1,2-dichloroethane were studied spectrophotometrically. The CT spectra, ionization potentials of donor and the thermodynamic data (K, △H，△S) of CTC were determined. The results show that the charge donation of N-substituted phenothiazines is fairly strong and depends on the polarity of the substituent.
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