Büyükgüngör Orhan, Odabaşoğlu Mustafa, Albayrak Ciğdem, Lönnecke Peter
Department of Physics, Ondokuz Mayis University, TR-55139 Samsun, Turkey.
Acta Crystallogr C. 2004 Jul;60(Pt 7):o470-2. doi: 10.1107/S0108270104010546. Epub 2004 Jun 12.
The title complex, 2C5H7N2+.C4H2O42-.C4H4O4, contains cyclic eight-membered hydrogen-bonded rings involving 2-aminopyridinium and fumarate ions. The fumaric acid molecules and fumarate ions lie on inversion centers and are linked into zigzag chains by O-H...O hydrogen bonds. The dihedral angle between the pyridinium ring and the hydrogen-bonded fumarate ion is 7.60 (4) degrees. The fumarate anion is linked to the pyridinium cations by intermolecular N-H...O hydrogen bonds. The heterocycle is fully protonated, thus enabling amine-imine tautomerization.
标题配合物2C₅H₇N₂⁺·C₄H₂O₄²⁻·C₄H₄O₄包含由2-氨基吡啶鎓离子和富马酸根离子形成的环状八元氢键环。富马酸分子和富马酸根离子位于对称中心上，并通过O-H...O氢键连接成锯齿链。吡啶鎓环与氢键连接的富马酸根离子之间的二面角为7.60(4)°。富马酸根阴离子通过分子间N-H...O氢键与吡啶鎓阳离子相连。杂环完全质子化，从而能够发生胺-亚胺互变异构。
