Abstract
The dynamic solvent effect on the intramolecular charge-transfer (ICT) -state formation of 4- (9-anthrylmethyl) -N, Ndimethylaniline (AMDMA) in the excited state was examined by using picosecond time-resolved fluorescence spectroscopy at high pressures. The non-exponential population decay of the local excited (LE) -state emission is analyzed by fitting to a double exponential function. As solvent viscosity increases, the rate of the ICT-state formation becomes noticeably faster than the solvent relaxation time, which is gauged by the longest component of longitudinal relaxation time of the solvent (τL). The effect on the ICT reaction of AMDMA in the excited state can be accounted for in terms of the pressure tuning effect of the solvent viscosity.
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