1-(2-Oxoindolin-3-ylidene)-4-[2-(trifluoromethyl)phenyl]thiosemicarbazide

In the title compound, C(16)H(11)F(3)N(4)OS, the dihedral angle between the aromatic ring systems is 69.15 (10)degrees. Intramolecular N-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen bonds generate S(5) and S(6) rings, respectively. A short N-H center dot center dot center dot F contact also occurs. In the crystal, inversion dimers linked by pairs of N-H center dot center dot center dot O hydrogen bonds generate R(2)(2)(8) loops. The dimers are linked by N-H center dot center dot center dot F hydrogen bonds, forming polymeric chains propagating in [100]. pi-pi interactions also exist between the centroids of the benzene rings of the 2-oxoindoline group at a distance of 3.543 (3) angstrom and a short C=O center dot center dot center dot pi contact occurs. Two F atoms of the trifluoromethyl group are disordered over two sets of sites in a 0.517 (8):0.483 (8) ratio.