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The title compound, C16H14F3N3OS·H2O, which had been previously characterized in the space group P-1 [Ren et al. (2011). Acta Cryst. E67, o270], has now been crystallized from 1-propanol in the monoclinic form in the space group P21/c. While the triclinic form is a Z′ = 2 crystal, the new monoclinic polymorph includes one main mol­ecule and one water lattice mol­ecule in the asymmetric unit. In the crystal, the water mol­ecule is sandwiched between neighboring main mol­ecules and behaves as both donor and acceptor in O—H...N and N—H...O hydrogen bonds with the imidazole N atoms. This pattern of chains parallel to [100] further inter­acts via O—H...N(pyridine) contacts.

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In the crystal structure of the title compound, C16H14F3N3OS·C3H8O, the mol­ecules are linked into chains along [010] via N—H...O and O—H...N hydrogen bonds. The triclinic form was reported by Ren et al. [(2011). Acta Cryst. E67, o270] and the first monoclinic form by Chen et al. [(2012). Acta Cryst. E68, o2015–o2016]. The fused five-and six-membered rings make a dihedral angle of 1.22 (2)°, while the benzene and pyridine rings make a dihedral angle of 10.15 (2)°.
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