Received 24 February 2008
The title compound, C24H19N5OS·H2O, was synthesized by the reaction of 4-benzoyl-3-methyl-1-phenylpyrazol-5-one and 2-hydrazino-1,3-benzothiazole. Proton transfer leads to the formation of a zwitterionic structure and the molecule exists in the enolate form. The pyrazolone ring makes dihedral angles of 35.4 (3), 69.7 (3) and 40.1 (3)° with the 1-phenyl, indirectly bound phenyl and benzothiazole ring systems, respectively. The molecules are linked into one-dimensional chains by a combination of N-HO, O-HN and O-HO hydrogen bonds.
For related literature, see: Akama & Tong (1996); Eller & Holzer (2004); Morakot et al. (2008); Rana et al. (2007); Sieron (2007); Kim et al. (2005); Costa et al. (2006); Usman et al. (2003). Two related compounds we have previously reported exist in the enamine-keto tautomeric form (Sun et al., 2006, 2007).
Data collection: SMART (Bruker, 1997); cell refinement: SAINT (Bruker, 1997); 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: LH2599 ).
This project was supported by the Jiangsu Planned Projects for Postdoctoral Research Funds (No. 0701001B).
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