Abstract
Abstract The solvent influence on the strength of H-bonds, observed by the shift Δν of the OH or NH stretching band, can be described by a solvent parameter LFMj for every solvent j: Δν(B, solventj) = LMFj Δv(B, vapor). This parameter is independent of the H-bond acceptor B and the donor. It is determined for a series of solvents relative to the solvent shift in CCl4. The solvent influences of weak H-bond acceptors are included. The solvent mechanism is very similar to H-bond cooperativity of cations or multiple H-bonds and can be described as a polarization effect of the lone pairs of the bonding XH groups by van der Waals interactions which can be studied by this method. The equations given can predict the not negligible solvent influence on H-bonds. The solvent factors are parallel to the Hildebrand parameters of the solvents or the Gutmann numbers and can be understood in terms of the influence of its intermolecular potentials. There are indications on influences of intermolecular zero point energies in the second approximation.
Published Version
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