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Acta Cryst. (2012). E68, o3148
[ doi:10.1107/S160053681204086X ]


D. Zou, X. Lü, S. Zhao and X. Liu

Abstract: The molecule of the title compound, C23H18Cl2N4O, assumes a non-planar conformation in which the pyrazolone ring forms dihedral angles of 32.61 (19), 76.73 (14) and 52.57 (19)° with the three benzene rings. The secondary amino group is involved in an intramolecular N-H...O hydrogen bond. In the crystal, molecules are linked by pairs of N-H...O hydrogen bonds, forming inversion dimers. An offset stacking interaction is observed between the chloro-substituted benzene rings protruding on both sides of these dimers [centroid-centroid distance = 3.862 (1) Å].

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