Acta Crystallographica Section C

Crystal Structure Communications

Volume 56, Part 12 (December 2000)

organic compounds

Acta Cryst. (2000). C56, 1505-1506 [ doi:10.1107/S0108270100012968 ]

The 1:1 adduct of Kemp's triacid with 2-aminopyridine

G. Smith, R. C. Bott and U. D. Wermuth

Abstract: The crystal structure determination of the molecular proton-transfer adduct of Kemp's triacid (cis-cis-1,3,5-trimethylcyclohexane-1,3,5-tricarboxylic acid, KTA) with 2-aminopyridine (2-APY), namely 2-aminopyridinium 3,5-dicarboxy-1,3,5-trimethylcyclohexanecarboxylate, 2-APY⁺·KTA^- or C₅H₇N₂⁺·C₁₂H₁₇O₆^-, has revealed a centrosymmetric hydrogen-bonded cyclic KTA homodimer repeating unit [OO 2.524 (4) Å] linked into a polymer structure through the pyridinium and amino groups of the 2-APY molecule [ON 2.736 (4), 2.989 (4) and 2.999 (4) Å].

Formula: C₅H₇N₂⁺·C₁₂H₁₇O₆^-