Ultrafast intermolecular hydrogen bond dynamics in the excited state of fluorenone

摘要: Steady-state fluorescence and time-resolved absorption measurements in pico- femtosecond time domain have been used to investigate the dynamics of hydrogen bond excited singlet (S1) state fluorenone alcoholic solvents. A comparison features steady-state spectra various kinds media demonstrates that two spectroscopically distinct forms S1 state, namely non-hydrogen-bonded (or free) molecule as well hydrogen-bonded complex, are responsible for dual-fluorescence behavior solutions normal solvents at room temperature (298 K). However, 2,2,2-trifluoroethanol (TFE), a strong donating solvent, emission from only complex is observed. Significant differences also observed temporal evolution spectroscopic properties protic aprotic following photoexcitation using 400 nm la...