Add time:07/27/2019         Source:sciencedirect.com

The photophysical properties of di-, mono- and non-ethyl 7-aminocoumarins have been investigated in different water/ethanol mixtures. The effect of the solvent composition on the spectral shifts and on the radiationless deactivation process depends on the molecular structure of the dye. The solvent effect is analyzed in terms of hydrogen bondings between the dye and protic solvents. The mechanism for internal conversion is discussed by two models: via a twisted intramolecular charge transfer (TICT) state, and by an hybridational change of the amino group (open-close umbrella-like motion, ULM model). Both models can explain the experimental results if solute-solvent hydrogen bonds are considered.

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