Abstract
The fluorescence excitation and dispersed fluorescence spectra of 2-pyridone (2PY), 2-hydroxypyridine (2HP), and 2HP(H 2O) n ( n = 1, 2) clusters in the electronic excited π–π ∗ state have been measured in a supersonic free jet expansion. The photoexcitation of various vibronic bands in the excited state of 2HP(H 2O) n ( n = 1, 2) does not provide fluorescence from 2PY(H 2O) n ( n = 1, 2) that can be formed by the excited state intermolecular proton transfer (ESPT), suggesting that ESPT is a minor decay channel from the excited state of 2HP(H 2O) n ( n = 1, 2).
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