Acta Cryst. (2011). E67, o2670  [ doi:10.1107/S1600536811037020 ]

4-[2-(4-Chlorophenyl)hydrazinylidene]-3-methyl-1H-pyrazol-5(4H)-one

H.-K. Fun, C. K. Quah, Nithinchandra and B. Kalluraya

Abstract: In the title compound, C₁₀H₉ClN₄O, the pyrazole ring [maximum deviation = 0.014 (2) Å] forms a dihedral angle of 7.06 (14)° with the chlorobenzene ring. The molecular conformation is stabilized by an intramolecular N-HO hydrogen bond, which generates an S(6) ring motif. In the crystal, inversion dimers linked by pairs of C-HO hydrogen bonds generate R₂²(16) ring motifs. The dimers are further connected by N-HN hydrogen bonds, thereby forming layers lying parallel to the bc plane.

Online 17 September 2011

Copyright © International Union of Crystallography
IUCr Webmaster