High-Pressure Picosecond Time-Resolved Fluorescence Studies on the Excited Intramolecular Charge-Transfer Kinetics of 4-(9-Anthrylmethyl)-N, N-Dimethylaniline in Alcohol

摘要

Picosecond time-resolved fluorescence spectroscopy has been used to examine the dynamic solvent effect on the excited intramolecular charge-transfer (ICT) -state formation in 4-(9-anthrylmethyl)-N, N-dimethylaniline (AMDMA) in linear alcohol solvents as a function of pressure. The non-exponential population decay of the local excited (LE)-state emission is analyzed by fitting to a double exponential functions. As solvent viscosity increases, the rate of the ICT-state formation of AMDMA becomes noticeably faster than the solvent relaxation time, which is gauged by the longitudinal relaxation time of the solvent (τ_L).