Date Published: May 01, 2010
Publisher: International Union of Crystallography
Author(s): Graham Smith, Urs D. Wermuth, David J. Young.
In the structure of the title salt, 2C12H10N3O4+·C12H8O6S22−·3H2O, determined at 173 K, the biphenyl-4,4′-disulfonate dianions lie across crystallographic inversion centres with the sulfonate groups interacting head-to-head through centrosymmetric cyclic bis(water)-bridged hydrogen-bonding associations [graph set R44(11)], forming chains. The 2-(2,4-dinitrobenzyl)pyridinium cations are linked to these chains through pyridinium–water N—H⋯O hydrogen bonds and a two-dimensional network is formed through water bridges between sulfonate and 2-nitro O atoms, while the structure also has weak cation–anion π–π aromatic ring interactions [minimum ring centroid separation = 3.8441 (13) Å].
For structural data on 2-(2,4-dinitrobenzyl)pyridine and related compounds, see Seff & Trueblood (1968 ▶); Scherl et al. (1996 ▶); Naumov et al. (2002 ▶, 2005 ▶). For bipyridine-4,4′-disulfonate compounds, see: Swift et al. (1998 ▶); Swift & Ward (1998 ▶); Holman & Ward (2000 ▶); Liao et al. (2001 ▶). For graph-set notation, see: Etter et al. (1990 ▶).