INTRAMOLECULAR CHARGE-TRANSFER INDUCED BY SOLVENT INTERACTION

The effect of solvation on the appearance of a red shifted Twisted Int ramolecular Charged Transfer emission is reviewed. Comparison between condensed phase and small cluster red fluorescence is discussed in the particular case of methyl 4-N,N-dimethylaminobenzoate (DMABME). Using a supersonic expansion DMABME-(H2O)(n) clusters are studied by monito ring at the same time mass spectra and dispersed fluorescence spectra as well as by lifetime measurements. For DMABME-(H2O)(n) clusters, a c lear red shifted fluorescence is observed readily when one or two wate r molecules are clustered to the molecule. The results of this work ar e compared with those obtained on the model compound 4-N,N-dimethylami nobenzonitrile (DMABN), where no TICT emission is observed in small DM ABN-(Solvent)(n) clusters.