Electronic spectra of jet-cooled tropolone-H2O clusters

The S1S0 fluorescence excitation and dispersed fluorescence spectra of jet-cooled tropolone-(H2O)n (n = 1–3) have been measured to investigate the effects of the solvation by water on proton tunneling. Three intermolecular vibrational modes have been observed in the dispersed fluorescence spectrum. Ab initio calculations suggest that two stable conformers exist for tropolone-(H2O)1. The structure of tropolone-(H2O)1 has been discussed by comparing the observed and calculated vibrational frequencies.