title: Crystal structure of (Z)-N'-[1-(3-methyl-5-oxo-1-phenyl-1,5-di-hydro-4H-pyrazol-4-yl-idene)prop-yl]benzene-sulfono-hydrazide.
abstract: The title compound, C19H20N4O3S, was synthesized by refluxing equimolar amounts of 1-phenyl-3-methyl-4-propionylpyrazol-5-one and benzene-sulfonyl hydrazide in ethanol. The compound crystallizes in the keto form and the carbonyl O atom forms an intra-molecular N-H⋯O hydrogen bond with the neighbouring NH group. There is also C-H⋯O short contact involving the neighbouring phenyl ring. Probably as a result of this, the phenyl ring is inclined to the pyrazolone ring by only 7.58 (12)°. The dihedral angle between the phenyl ring and the benzene-sulfonyl ring is 22.78 (11)°. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers with an R (2) 2(14) ring motif. The dimers are linked via pairs of C-H⋯O hydrogen bonds, forming chains propagating along [100].
authors.affiliation: Institute of Applied Chemistry, Xinjiang University, Urumqi, 830046 Xinjiang, People's Republic of China.
authors.forename: Chuan-Chuan
authors.initials: CC
authors.lastname: He
authors.affiliation: Institute of Applied Chemistry, Xinjiang University, Urumqi, 830046 Xinjiang, People's Republic of China.
authors.forename: Guan-Cheng
authors.initials: GC
authors.lastname: Xu
keywords: crystal structure; hydrogen bonding; polymer chain; pyrazolone derivative