摘要：

Free energies, enthalpies, and entropies of ionization of a series of α-substituted 4-picolinium ions in pure anhydrous methanol have been determined by the differential potentiometric method. Three points of general interest emerge from the data. First, the effects of alkyl group substituents are remarkably small; second, pK values are very nearly equal to those found for aqueous solutions; and third, there is no correlation between free energies and enthalpies of ionization for these acids.

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