FT-IR Study of the Interaction Between H2O, D2O, HOD, and Pyridines

Abstract The complexes between H2O, D2O, HOD and pyridine have been studied in 1,2-dichloroethane by FT-IR spectrometry. Equal splittings of the stretching bands of H2O and D2O about their uncoupled vibrations are observed. The coupling between the asymmetric and symmetric vibrations reaches a value of zero when the band separation is greater than 500 cm−1 for the OH vibrations and 365 cm−1 for the OD vibrations. The vOH stretching frequencies of the HOD ‥ complexes and the vOD stretching frequencies of the DOH‥ complexes increase by complex formation. These features are explained by an electronic reorganization within the hydrogen bond.