Abstract
Mixing 2-butynoic acid and 2-aminopyridine in acctone produces the salt 2-aminopyridinium 2-butynoate (4) in high yield. An X-ray structure determination of 4 (Space Group P21/n, Z = 4) shows it to contain short acetylene-acetylene contacts as well as short contacts between the pyridine N atom and the β-carbon atom of the butynoate moiety. The contacts are between centrosymmetrically-rclated “dimer pairs” of the cocrystalline salt, and are not part of an infinite array. The material is stable to heating or exposure to 60Co γ-rays.