A remarkable solvent effect on intensity of molecular electronic transitions has been found in near UV absorption spectra of benzil. Great intensity enhancement is observed in alcohols and in chloromethanes as well as in nitriles. Parameters which are required to explain the origin of those environmental intensity enhancement are neither solvent refractive indexes nor polarities. A some rotationally flexible freedom around the –OC–CO– axis of benzil in the solvent seems important. Week complex formation between the solute and the solvent molecule is likely to play an important role. Similar solvent effects are found for absorption spectra of benzophenone and dicyclohexyl ketone, but with more complexity regarding their spectral shifts in contrast to the case of benzil.
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Miyata et al. (1988) studied this question.
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