Received 13 April 2013
Theasymmetric unit of the title salt, C19H17N2S+·Cl-·0.75H2O, contains two symmetrically independent formula units of the carbenium salt along with three water molecules. The water molecules are only 50% occupated, and one of them is positioned in a hydrophobic pocket not forming any hydrogen bonds. The conformation of the independent cations is very similar, with dihedral angles of 61.0 (2) and 61.5 (3)° between the benzene rings. They form quasi-centrosymmetric couples via - stacking interactions between the benzene and imidazo[2,1-b]thiazole rings [centroid-centroid distances = 3.718 (3) and 3.663 (3) Å]. In the crystal, O-HCl hydrogen bonds lead to the formation of a helical anion-water chain along the c-axis direction. The cations connect to the anion-water chain through C-HCl interactions, generating a three-dimensional supramolecular network. O-HS hydrogen bonds and C-HO interactions also occur.
For applications in catalysis of abnormal N-heterocyclic carbenes, see: Mattson et al. (2006); Liu et al. (2008); Padmanaban et al. (2011). For related structures, see: Huang et al. (2011); Akkurt et al. (2011, 2007); Song et al. (2008).
Data collection: SMART (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); 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: LD2101 ).
The authors thank the Scientific Researching Fund Projects of Yunnan Educational Department (grant No. 22012Z017) and the Youth Scientific Fund Projects of Yunnan Normal University for financial support.
Akkurt, M., Güzeldemirci, N. U., Karaman, B. & Büyükgüngör, O. (2011). Acta Cryst. E67, o184-o185.
Akkurt, M., Yalçin, S. P., Gürsoy, E., Güzeldemirci, N. U. & Büyükgüngör, O. (2007). Acta Cryst. E63, o3103.
Bruker (2008). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Flack, H. D. (1983). Acta Cryst. A39, 876-881.
Huang, G. L., Sun, H. S., Qiu, X. J., Jin, C., Lin, C., Shen, Y. Z., Jiang, J. L. & Wang, L. Y. (2011). Org. Lett. 13, 5224-5227.
Liu, Q., Perreault, S. & Rovis, R. (2008). J. Am. Chem. Soc. 130, 14066-14067.
Mattson, A. E., Zuhl, A. M., Reynolds, T. E. & Scheidt, K. A. (2006). J. Am. Chem. Soc. 128, 4932-4933.
Padmanaban, M., Biju, A. T. & Glorius, F. (2011). Org. Lett. 13, 98-101.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Song, G. Y., Zhang, Y. & Li, X. W. (2008). Organometallics, 13, 1936-1943.