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Amixture of Cl2CHCOOH-16O2 and Cl2CHCOOH-18O2 was combined with an excess of a pyridine and studied by NMR at 23_C, -43_C, and -81_C. The 1:1 complexes were analyzed by isotopic perturbation of equilibrium. Plots of OH chemical shift and of 13C isotope shift vs. pKa of the pyridinium ion both exhibit maxima ~ 5, when the basicities of the hydrogen-bond acceptors become matched, the hydrogen bond is...
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