Abstract
OH stretching vibrations of phenol−(H2O)n clusters (n = 1, 3) in the S1 state have been observed by UV−IR double resonance spectroscopy, where the fluorescence dip induced by the IR excitation was monitored. The spectra were analyzed by comparing with those of the S0 state reported in a previous work. It was found that a frequency reduction of the phenolic OH stretching vibration and an enhancement of the interactions among the hydrogen bond network in the cluster were much larger in the S1 state than in the S0 state, representing the increase in acidity of phenol upon the electronic excitation. The nonradiative process of the vibrationally excited phenol is also discussed based on the fluorescence-dip spectrum of the deuterated phenol in S1.
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