Solvation of heterocyclic nitrogen compounds by methanol and water

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Abstract
The proton-donating and -accepting abilities of water and methanol to various nitrogen-containing compounds have been determined by calorimetric analysis. Water is a better proton donor than methanol but methanol is a better proton acceptor than water. The interactions by water and methanol at the nitrogens of the diazines follow trends expected from relative proton affinities, pK's, and theoretical calculations. Electrostatic interactions by the diazine nitrogens with pyridine parallel the interactions found for methanol and water at these nitrogens.

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