Effect of deuteration on hydrogen bonds
Abstract
A study of the 1 : 1 interaction of CH3OD and t-C4H9OD as well as the corresponding hydroxy derivatives with electron donor molecules has shown that the enthalpies of formation of complexes are generally increased by ∼1 to 2 kJ mol–1 on deuteration. Enthalpies of dimerization of t-C4H9OH and t-C4H9OD are comparable. Deuterium bond energies may be lower than hydrogen bond energies only for very short hydrogen bonds. The shift in the O—H stretching frequency ΔνOH is related to ΔνOD by the relation, ΔνOH≈ 1.414 ΔνOD as expected on the basis of mass effect alone.