Combination Vibration of Neighbouring Molecules in Liquid Hod (IN D2O)

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Abstract
Combination vibrations of neighbouring H-bonded molecules show a characteristic absorption band. This band appears in the spectra if H-bonds are formed and vanishes when the H-bonds are broken. Different observations allow the conclusion that the combination v OH + v OD in spectra of liquid HOD (in D2O) may be assigned to a combination vibration (v OH + v OD) 2mol of two neighbouring molecules (HOD and D2O). The intensity of thisv OD) 2mol band was investigated at different temperatures. It results an estimation of the van't Hoff enthalpy change of H-bond formation in liquid water ΔHo(OH O) = -15.4 ± 1.0 kJ/mole (= -3. 7 ± 0. 2 kcal/mole).