title: 5-(3-Fluoro-phen-yl)-1-phenyl-pyrazolidin-3-one.
abstract: In the mol-ecule of the title compound, C(15)H(13)FN(2)O, the phenyl and fluorophenyl rings are oriented at a dihedral angle of 77.92 (3)°. The pyrazolidine ring adopts an envelope conformation. An intra-molecular C-H⋯N hydrogen bond results in the formation of a five-membered ring adopting an envelope conformation. In the crystal structure, inter-molecular N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules. There are C-H⋯π contacts between between aromatic H atoms and the phenyl and fluorophenyl rings. A π-π contact between phenyl rings [centroid-centroid distance = 3.926 (1) Å] is also observed.
authors.affiliation: Department of Applied Chemistry, College of Science, Nanjing University of Technology, Nanjing 210009, People's Republic of China.
authors.forename: Yuan-Yuan
authors.initials: YY
authors.lastname: Liu
authors.forename: Hong
authors.initials: H
authors.lastname: Shi
authors.forename: Qing-Yan
authors.initials: QY
authors.lastname: Chu
authors.forename: Hong-Jun
authors.initials: HJ
authors.lastname: Zhu