Abstract
The frequency shift, Δν, of the O—H stretching mode in the IR spectra of the H-complexes of phenol with electron donor molecules BXi (B is the n- or π-donor center and Xi are substituents; a total of eight series), the change in the Gibbs free energy, ΔG, due to H-complexation, and the parameter β (a measure of the ability of BXi molecules to donate an electron pair; two series) are determined by both the electrostatic interaction and charge transfer in the formation of H-complex. The Δν, ΔG, and β values depend not only on the inductive and resonance effects, but also the polarizability of substituents characterized by the σα parameters.
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Egorochkin, A.N., Kuznetsova, O.V. Infrared spectroscopy of hydrogen bond and substituent effects in electron donor molecules. Russian Chemical Bulletin 51, 961–966 (2002). https://doi.org/10.1023/A:1019649215725
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DOI: https://doi.org/10.1023/A:1019649215725