Date Published: June 01, 2011
Publisher: International Union of Crystallography
Author(s): Sit Foon Cheng, Seik Weng Ng.
In the title hydrated molecular salt, C12H9N2+·C4H5O6−·2H2O, the cation is almost planar (r.m.s. deviation = 0.014 Å); the carbon skeleton of the anion assumes a trans conformation [C—C—C—C torsion angle = −179.86 (14)°]. The carboxyl end of one hydrogen tartrate anion forms a short hydrogen bond to the carboxylate end of another anion [O⋯O = 2.508 (2) Å] in a head-to-tail manner, forming a chain; the chains and water molecules interact, generating an O—H⋯O hydrogen-bonded layer. The cation binds to the layer by an N—H⋯O hydrogen bond.
For the trihydrated 1,10-phenanthrolin-1-ium salts of d- and l-tartaric acid, see: Derikvand & Olmstead (2010 ▶); Wang et al. (2006 ▶).