In the structure of the title compound, C(15)H(14)O(2)S, the benzene ring is nearly coplanar with the thio-phene ring. The hydroxy group substituted at C2 position is in an antiperi-planar conformation with respect to the phenyl ring. The crystal structure exhibits weak intramolecular O-H⋯O hydrogen bonding.

In the title compound, C(16)H(15)BrO(4)S, the thio-phene ring is not coplanar with the benzene ring; the dihedral angle between the two planes is 11.08 (12)°. The crystal structure is characterized by C-H⋯O inter-actions. Weak intra-molecular C-H⋯O hydrogen bonds also occur.

In the title compound, C(22)H(21)NO(5)S, the 2-naphthol group and the thio-phene ring are almost coplanar, with a dihedral angle of 5.75 (7)°. The structure is stabilized by intra-molecular O-H⋯O, O-H⋯N and C-H⋯S, and inter-molecular C-H⋯O hydrogen-bonding inter-actions.

In the title compound, C(30)H(38)O(4)S(2), the centroid of the benzene ring lies on a center of inversion. The thio-phene ring is aligned at 49.8 (1)° with respect to the benzene ring. The alkyl chain adopts an extended zigzag conformation.

In the title compound, C11H8N2O2S, the oxadiazinone ring is nearly planar [maximum deviation = 0.016 (4) Å], and is approximately coplanar with the benzo-thio-phene ring system [dihedral angle = 3.1 (5)°]. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds, forming chains running along the b-axis direction.

In the title Schiff base, C(8)H(8)N(4)S, a condensation product of 5-methyl-thio-phene-2-carboxaldehyde and 3-amino-1,2,4-triazole, the dihedral angle between the triazolyl and thienyl rings is 6.44 (14)°. The compound exists as a polymeric chain arising from inter-molecular N-H⋯N bonding.

In the approximately planar molecule of the title compound, C(11)H(8)N(4)O(4)S, the dihedral angle between the thio-phene and benzene rings is 5.73 (10)°. In the crystal structure, bifurcated inter/intra-molecular N-H⋯(O,O) hydrogen bonds are present. The intermolecular links lead to inversion dimers containing an R(2) (2)(12) graph-set motif.

In the title mol-ecule, C(13)H(14)O(3)S(2), the thio-phene and benzene rings form a dihedral angle of 13.86 (13)°. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into layers parallel to the ab plane.

In the title compound, C(25)H(18)O(2)S·C(4)H(8)O(2), there are inter-molecular O-H⋯O hydrogen bonds between the main mol-ecule and the solvent molecule. The thio-phene ring is oriented at dihedral angles of 70.87 (7) and 75.36 (4)° with respect to the mean planes of the two naphthyl ring systems.

In the title compound, C(15)H(11)NS, the dihedral angle between the thio-phene and 1-naphthyl rings is 31.42 (11)°. The mol-ecule adopts a trans configuration about the central C=N bond. In the crystal, the mol-ecules are connected via weak C-H⋯π inter-actions.