title: 5-Fluoro-3-(2-phenyl-hydrazinyl-idene)indolin-2-one.
abstract: In the title compound, C(14)H(10)FN(3)O, the six- and five-membered rings of the isatin moiety and the six-membered ring of phenyl-hydrazone are nearly planar with r.m.s. deviations of 0.0003, 0.0004 and 0.007 Å, respectively. The dihedral angle between the phenyl ring and the isatin ring system is 6.09 (9)°. The mol-ecular structure is stabilized by a strong intra-molecular N-H⋯O hydrogen bond, leading to the formation of a pseudo-six-membered ring, generating an S(6) ring. The crystal structure features inter-molecular N-H⋯O inter-actions.
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Wei
authors.forename: Shuo
authors.initials: S
authors.lastname: Tian
authors.forename: Hong
authors.initials: H
authors.lastname: Shen
authors.forename: Jie
authors.initials: J
authors.lastname: Sun
authors.forename: Hai-Bo
authors.initials: HB
authors.lastname: Wang