Spectral Signatures of Four-Coordinated Sites in Water Clusters: Infrared Spectroscopy of Phenol-(H2O)n (∼20 ≤ n ≤ ∼50)

We report infrared spectra of phenol-(H2O)(n) (similar to 20 <= n <= similar to 50) in the OH stretching vibrational region. Phenol-(H2O)(n) forms essentially the same hydrogen bond (H-bond) network as that of the neat water cluster, (H2O)(n+1). The phenyl group enables us to apply the scheme of infrared ultraviolet double resonance spectroscopy combined with mass spectrometry, achieving the moderate size selectivity (0 <= Delta(n) <= similar to 6). The observed spectra show clear decrease of the free OH stretch band intensity relative to that of the H-bonded OH band with increasing cluster size n. This indicates increase of the relative weight of four-coordinated water sites, which have no free OH. Corresponding to the suppression of the free OH band, the absorption peak of the H-bonded OH stretch band rises at similar to 3350 cm(-1). This spectral change is interpreted in terms of a signature of four-coordinated water sites in the clusters.