Received 22 November 2011
In the title compound, C24H17N2O4+·NO3-·0.25H2O, the central pyridine ring of the 2',6'-bis(4-carboxyphenyl)-4,4'-bipyridin-1-ium cation is almost coplanar with one benzene ring [dihedral angle = 1.03 (5)°], while it makes dihedral angles of 9.59 (5)° with the other benzene ring and 13.66 (6)° with the pyridinium ring. In the crystal, N-HO and O-HO hydrogen bonds link the cations and nitrate anions into a sheet in the (302) plane. The crystal structure also exhibits - interactions between the central pyridine ring and the benzene rings of neighboring molecules [centroid-centroid distance = 3.6756 (13) Å].
Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: XP in SHELXTL and Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BT5723 ).
The authors thank Jilin University for supporting this work.
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