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In the title compound, C14H13N3O2S, the dihedral angle between the thio­phene and phenyl rings is 24.95 (8)°. The mol­ecular structure is consolidated by intra­molecular N—H...O and C—H...S inter­actions. The crystal structure features N—H...N and N—H...O hydrogen bonds forming centrosymmetric R22(12) dimers, which are linked into a two-dimensional network parallel to (011) with an S(6)R22S(6) motif. In addition, π–π stacking inter­actions [centroid–centroid distance = 3.7013 (12) Å] occur between the thio­phene and phenyl rings of adjacent mol­ecules.

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In the title compound, C16H14O4, the benzene rings are inclined at a dihedral angle of 75.14 (9)°. The torsion angle of the bridging O—C—C—O group is −76.50 (11)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming C(6) chains along [100]. Furthermore, C—H...π inter­actions and π–π stacking inter­actions [centroid–centroid distances = 3.6957 (7) and 3.6735 (8) Å] contribute to the stability of the crystal packing.

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In the title compound, C12H7N3OS, the five-membered 1,3-thia­zolidine ring is nearly planar [maximum deviation = 0.032 (2) Å] and makes a dihedral angle of 84.14 (9)° with the phenyl ring. In the crystal, mol­ecules are linked by C—H...N hydrogen bonds into infinite chains along [-101]. C—H...π inter­actions contribute to the arrangement of the mol­ecules into layers parallel to (101).
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