Received 11 April 2012
The asymmetric unit of the title organic salt, 2C4H7N2+·C10H6O6S22-·2H2O, consists of a 2-methylimidazolium cation, a half of a naphthalene-1,5-disulfonate anion, which lies about a center of symmetry, and a water molecule. In the crystal, N-HO and O-HO hydrogen bonds link the cations, anions and water molecules into the layers parallel to (111).
For general background to dielectric-ferroelectric phase transitions, see: Ye et al. (2009); Zhang et al. (2009). For the structures of naphthalene-1,5-disulfonate salts with N-heterocyclic cations, see: Janczak & Perpétuo (2008); Wang et al. (2008).
Data collection: CrystalClear (Rigaku, 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: YK2053 ).
The author is grateful to the starter fund of Southeast University for the purchase of the diffractometer.
Janczak, J. & Perpétuo, G. J. (2008). Acta Cryst. C64, o91-o94.
Rigaku (2005). CrystalClear. Rigaku Corporation, Tokyo, Japan.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Wang, Z.-L., Jin, L.-Y. & Wei, L.-H. (2008). Acta Cryst. E64, o674.
Ye, H. Y., Fu, D. W., Zhang, Y., Zhang, W., Xiong, R. G. & Huang, S. P. (2009). J. Am. Chem. Soc. 131, 42-43.
Zhang, W., Cheng, L. Z., Xiong, R. G., Nakamura, T. & Huang, S. P. (2009). J. Am. Chem. Soc. 131, 12544-12545.