Abstract
Out-of-plane vibrations which may be effective in vibronic coupling between nπ* and ππ* states of aromatic carbonyl compounds are investigated, and the probable importance of these vibrations in radiationless transitions is demonstrated through the dependence of vibrational features, quantum yields, and lifetimes of π* → π phosphorescence upon deuteration of the COR (R is H or an alkyl) group, nature of solvents, and molecular structure (e.g., ketones versus aldehydes).
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