Received 25 September 2012
aResearch Institute of Shaanxi Yanchang Petroleum (Group) Co. Ltd, Ke Ji No. 2 Road 75, Xi'an 710075, Shaanxi, People's Republic of China,bDepartment of Pharmacology, School of Pharmacy, Forth Military Medical University, Chang-le West Road 17, Xi'an 710032, Shaanxi, People's Republic of China, and cCollege of Chemistry & Chemical Engineering, Xianyang Normal University, Xianyang 712000, Shaanxi, People's Republic of China
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The title hydrated salt, C18H18N42+·2Cl-·2H2O, sits about an inversion centre, such that the asymmetric unit contains one half-molecule. In the crystal, hydrogen bonds occur between the water molecules and chloride anions, and there is - stacking of the benzene and imidazole rings of inversion-related pairs of molecules, with a centroid-centroid distance of 3.704 (17) Å.
Data collection: APEX2 (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: PK2446 ).
The work was supported by 2009ZX09103-111, the China Postdoctoral Science Foundation (No. 2009041446), the Special Research Fund of the Education Department of Shaanxi Province (12 J K0631) and the Special Research Fund of Xianyang Normal University (11XSYK204). We thank the Instrumental Analysis Center of Northwest University for the data collection.
Bruker (2002). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Harrell, C. C., Kohli, P., Siwy, Z. & Martin, C. R. (2004). J. Am. Chem. Soc. 126, 15646-15647.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Sun, T., Li, K., Lai, Y., Chen, R. & Wu, H. (2010). Acta Cryst. E66, m1058.