Acta Cryst. (2009). E65, o2333  [ doi:10.1107/S1600536809034448 ]

1,10-Phenanthrolin-1-ium 2-carboxy-4,5-dichlorobenzoate

G. Smith, U. D. Wermuth and J. M. White

Abstract: In the structure of the 1:1 proton-transfer compound of 1,10-phenanthroline with 4,5-dichlorophthalic acid, C₁₂H₉N₂⁺·C₈H₃Cl₂O₄^-, determined at 130 K, the 1,10-phenanthrolinium cation and the hydrogen 4,5-dichlorophthalate anion associate through a single N-HO_carboxyl hydrogen bond giving discrete units which have no extension except through a number of weak cation C-HO_anion associations and weak cation-anion aromatic ring - interactions [minimum centroid-centroid separation = 3.6815 (12) Å]. The anions are essentially planar "[maximum deviation 0.214 (1) Å (a carboxyl O)] with the syn-related H atom of the carboxyl group, forming a short intramolecular O-HO_carboxyl hydrogen bond.

Online 5 September 2009

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