title: 1-(4-Fluoro-phen-yl)-2-(1H-1,2,4-triazol-1-yl)ethanone hemihydrate.
abstract: In the title compound, C(10)H(8)FN(3)O·0.5H(2)O, the dihedral angle between the mean planes of the rings is 99.80 (4)°. The water mol-ecule lies on a twofold axis. Weak inter-molecular O-H⋯N and C-H⋯O hydrogen bonds link one water mol-ecule with four phenyl-ethanone mol-ecules, while inter-molecular C-H⋯O hydrogen bonds involving the ketone group link phenyl-ethanone mol-ecules into layers parallel to (100).
authors.affiliation: Department of Applied Chemistry, College of Science, Nanjing University of Technology, Nanjing 210009,  People's Republic of China.
authors.forename: Dong-Liang
authors.initials: DL
authors.lastname: Liu
authors.forename: Chen
authors.initials: C
authors.lastname: Li
authors.forename: Xin
authors.initials: X
authors.lastname: Tian
authors.forename: Song
authors.initials: S
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Xiao