Acta Cryst. (2004). E60, o2252-o2254  [ doi:10.1107/S1600536804027965 ]

4-(Dimethylamino)pyridinium 2-butoxy-3-dicyanomethylene-4-oxocyclobut-1-en-1-olate

R. I. Zubatyuk, V. N. Baumer, A. L. Tatarets, L. D. Patsenker and O. V. Shishkin

Abstract: In the crystal structure of the title compound, C₇H₁₁N₂⁺·C₁₁H₉N₂O₃^-, both the cation and the anion lie on a mirror plane. Three C atoms of the butyl group are disordered over two positions related by this plane. The bond-length analysis shows that the surplus negative charge of the anion is delocalized between the cyclobutene ring and the dicyanomethylene group. The 4-dimethylaminopyridinium cation has an intermediate aromatic-quinoid structure.

Online 6 November 2004

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