A series of tri-substituted thiourea derivatives were synthesized by the reaction of 1,3,5-triacetylbenzoyl isothiocyanate with aminoacids and aniline derivatives. All thiourea derivatives were characterized by FT-IR, 1 H and 13 C NMR spectroscopy. Antibacterial activities against wild-type Escherichia coli American Type Culture Collection 8739 were determined by use of Downloaded by [University of Nebraska, Lincoln] at 07:04 01 June 2016 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 the turbidimetric method to evaluate the effect of varying amino groups on the synthesized thioureas. Tris-thiourea derivatives bearing ortho-chloroaryl substituents showed excellent antibacterial activity against E. coli with minimal inhibitory concentration (MIC) of 96 ppm. The optimum inhibition was dependent on the type of amines and the position of the halogen in aniline.
The asymmetric unit of the title compound, C22H18N4O2S2, contains two molecules. In one of them, the dihedral angles between the central benzene ring and the phenyl rings are 16.97 (8) and 20.97 (8)°, while the phenyl rings make a dihedral angle of 37.87 (8)°. In the other molecule, the corresponding values are 34.92 (7), 53.90 (7) and 60.68 (8)°, respectively. In each molecule, two intramolecular N—H⋯O hydrogen bonds generate S(6) rings and a short C—H⋯S contact also occurs. In the crystal, N—H⋯S, N—H⋯O, C—H⋯O and C—H⋯S interactions link the molecules into a three-dimensional network.
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