Abstract
The first title compound, C(10)H(7)FN(2)OS, crystallizes in space group P1 with two independent mol-ecules in the asymmetric unit, which form a dimer with an R (2) (2)(8) motif through pairwise N-H⋯N hydrogen bonds. In the crystal of (I), N-H⋯O hydrogen bonds bind the dimers into zigzag ribbons running along the [100] direction, generating R (4) (4)(14) motifs. The second title compound, C(10)H(7)ClN(2)OS (space group I2/a), contains one mol-ecule in the asymmetric unit, which forms a dimer with an R (2) (2)(8) motif via inversion symmetry. In the extended structure, the mol-ecules form zigzag ribbons in the [100] direction by N-H⋯N and N-H⋯O hydrogen bonds, resulting in consecutive R (4) (1)(8)R (2) (1)(5)R (2) (2)(8)R (2) (1)(5)R (4) (1)(8) motifs. The Hirshfeld surface analyses of the compounds (I) and (II) indicates that the most important factors influencing the crystal packing are H⋯H inter-actions [21.1% for mol-ecule A of (I), 20.3% for mol-ecule B of (I) and 21.0% for (II)].