The photophysical properties of 7-amimocoumarin derivatives with different alkylation degrees are studied in water and in different monoalcohols.Specific hydrogen bonds between the solute and protic solvents are considered to explain spectral shifts and internal conversion process.The mechanism for the internal conversion process via a twisted intramolecular charge transfer state and the umbrella-like motion model is discussed.
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Arbeloa et al. (1993) studied this question.