A spectroscopic study of carbanions and corresponding nitranions: ion pair formation in the ground state and the first excited state
Abstract
The carbanions of fluorene, 4,5-methylenephenanthrene, and indene and the nitranions of carbazole, 4,5-iminophenanthrene, and indole have been investigated by optical absorption and emission spectroscopy. From the influence of alkali counterions on the absorption and emission it appears that in the first excited singlet state the contact ion pairs of the carbanions are converted into solvent-separated ion pairs. The nitranions exhibit stronger interactions with the alkali ions than the corresponding carbanions both in the ground and in the first excited state. The experimental results can be explained by considering the charge distributions in the ground state of the ions and the redistribution of the π electrons after excitation.
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