Received 27 September 2008
The asymmetric unit of the title compound, C17H17N2O2+·Cl-·H2O, contains one-half of the cation, one-half of a water molecule and a chloride anion. The complete cation is generated by crystallographic two-fold symmetry, with one C atom lying on the rotation axis. The O and Cl atoms have site symmetry 2. The imidazolidium ring is oriented at a dihedral angle of 4.15 (3)° with respect to the 4-methoxyphenyl ring and an intramolecular C-HO interaction occurs. In the crystal structure, intermolecular O-HCl and C-HCl hydrogen bonds link the molecules. There is a - contact between the imidazolidium and 4-methoxyphenyl rings [centroid-to-centroid distance = 3.625(3 Å]. There is also a C-H contact between the methyl group and the 4-methoxyphenyl ring.
Data collection: SMART (Bruker, 1998); cell refinement: SAINT (Bruker, 1999); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2003); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HK2542 ).
The authors are grateful to the National Natural Science Foundation of China (grant No. 20772103), the Natural Science Foundation of Jiangsu Province (grant No. BK 2007028) and the Surpassing Project of Jiangsu Province (grant No. CX07S_016z) for financial support.
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