Experimental Crystal data

disorder in solvent or counterion; R factor = 0.060; wR factor = 0.123; data-to-parameter ratio = 13.9. Theasymmetric unit of the title salt, C19H17N2S +Cl0.75H2O, 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—H Cl 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—H Cl interactions, generating a three-dimensional supramolecular network. O—H S hydrogen bonds and C—H O interactions also occur. Related literature For applications in catalysis of abnormal N-heterocycli