The interaction between donor 8-hydroxyquinoline (HQ) and π - acceptor 1, 4-benzoqinone (BQ) has been studied in the solution as well as in the solid state. Infrared spectroscopic data indicate that a charge transfer interaction between the donor and acceptor are due to π → π*/ n → π* transition by the formation of radical ion pairs. In solution state, the formation constant, the extinction coefficient, the free energy and transition energy of the resulting charge transfer complex (CTC) were determined. The optimum experimental conditions, such as time, temperature and solvents for the CTC formation were established.
Key words: 8–Hydroxyquinoline, 1, 4–benzoqinone, the formation constant for the charge transfer complex and infrared spectroscopic.
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