INFRARED DEPLETION SPECTROSCOPY OF THE ANILINE-H2O+ CLUSTER CATION

The vibrational spectrum of the aniline-H2O+ cluster cation in the NH and OH stretching vibration region has been measured as depletion of t he ion signal induced by the infrared multiphoton decomposition of the cluster cation. Three absorption bands have been observed at 3440, 36 36 and 3715 cm(-1), which have been assigned to the free NH stretching vibration of the aniline molecule, the symmetric and the anti-symmetr ic stretching vibrations of H2O, respectively. The analysis of the spe ctrum suggests that then is a hydrogen bond between one of the NH bond s of the aniline cation and the lone pair of the oxygen atom of H2O. ( C) 1997 Elsevier Science B.V.