organic compounds
Open access
In the title compound, C19H12FN3O2S, the chromene ring system and the thiazole ring are approximately planar [maximum deviations of 0.023 (3) Å and 0.004 (2) Å, respectively]. The chromene ring system is inclined at angles of 4.78 (10) and 26.51 (10)° with respect to the thiazole and benzene rings, respectively, while the thiazole ring makes a dihedral angle of 23.07 (12)° with the benzene ring. The molecular structure is stabilized by an intramolecular C—HO hydrogen bond, which generates an S(6) ring motif. The crystal packing is consolidated by intermolecular N—HO hydrogen bonds, which link the molecules into chains parallel to [100], and by C—Hπ and π–π [centroid–centroid distance = 3.4954 (15) Å] stacking interactions.
organic compounds
Open access
The title compound, C12H10BrN3O2S, exists in an E configuration with respect to the C=N bond. The approximately planar 2H-chromene ring system [maximum deviation = 0.059 (1) Å] is inclined at a dihedral angle of 17.50 (5)° with respect to the mean plane through the thiosemicarbazide unit and an intramolecular N—HN hydrogen bond generates an S(5) ring. In the crystal structure, adjacent molecules are linked by N—HS hydrogen bonds, forming [010] chains built up from R22(8) loops, such that each S atom accepts two such bonds. These chains are further interconnected into sheets parallel to the ab plane via short BrO interactions [3.0732 (13) Å] and a π–π aromatic stacking interaction [3.7870 (8) Å] is also observed.
organic compounds
Open access
In the title compound, C19H13N3O3S·0.5H2O, both organic molecules (A and B) exist in E configurations with respect to the acyclic C=N bond and have similar overall conformations. In molecule A, the essentially planar thiazole ring [maximum deviation = 0.010 (2) Å] is inclined at interplanar angles of 11.44 (10) and 32.50 (12)°, with the 2H-chromene ring system and the benzene ring, respectively. The equivalent values for molecule B are 0.002 (2) Å, 7.71 (9) and 12.51 (12)°. In the crystal structure, neighbouring molecules are interconnected into infinite layers lying parallel to (010) by O—HO, O—HN, N—HO and C—HO hydrogen bonds. Further stabilization of the crystal structure is provided by weak intermolecular C—Hπ and π–π [centroid–centroid distance = 3.6380 (19) Å] interactions.