The formation of transient N-vinylcarbazole cation-radical and pyromellitic dianhydride anion-radical was demonstrated for the N-vinylcarbazole-pyromellitic dianhydride-solvent system by means of flash spectroscopy. The transient decay process was found to be solvent-dependent. In 1,2-dichloroethane the decay of the anion-radical was of the first-order at initial stage (t<100 μs), and the second-order kinetics (t<100 μs) then followed. In acetonitrile the transient decay followed the second-order kinetics in the whole time region.
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Shirota et al. (1974) studied this question.
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