Stage of electron transfer between p-phenylenediamine and chloranil in methanol was studied and a strictly reversible redox conversion of reagents was observed at low temperatures of -50 to -90°C. At positive temperatures, the proton transfer initiates a polycondensation yielding a polyaminoquinone of brown color. The nature of the absorption bands of charge-transfer complexes in the visible spectral range is discussed. Quantum-chemical calculations of excited reaction complexes and of absorption spectra of polyaminoquinone were performed.
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