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In the title compound, C14H9F3N2O, the best planes of the benzimidazole group and benzene ring form a dihedral angle of 26.68 (3)°. In the crystal, N—H...N hydrogen bonds link the mol­ecules into infinite chains parallel to the c axis. Stacking inter­actions between the benzimidazole groups [centroid–centroid distance = 3.594 (5) Å] assemble the mol­ecules into layers parallel to (100). The trifluoro­methyl group is disordered over three sets of sites with site-occupancy factors of 0.787 (4), 0.107 (7) and 0.106 (7).

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In the title mol­ecule, C24H19BrN2O5S, the pyrimidine ring is in a flattened half-chair conformation and the 4-acet­oxy­phenyl group is substituted axially to this ring. The thia­zole ring is essentially planar [with a maximum deviation of 0.012 (2) Å for the N atom] and forms dihedral angles of 17.65 (13) and 88.95 (11)° with the bromo- and acet­oxy-substituted benzene rings, respectively. The dihedral angle between the benzene rings is 81.84 (13) Å. In the crystal, pairs of weak C—H...O hydrogen bonds lead to the formation of inversion dimers. A weak C—H...π inter­action and π–π stacking inter­actions with centroid–centroid distances of 3.5903 (14) Å are observed.

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The asymmetric unit of the title compound, C12H12ClNOS, contains three independent mol­ecules, with the thio­chroman ring adopting a sofa conformation in each one. The crystal structure features C—H...O inter­actions; one of the O atoms accepts three such bonds. Together, the hydrogen bonds give rise to a molecular tape propagating in [010].

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In the title mol­ecule, C13H8F2N2, the dihedral angle between the benzimidazole ring system and the di­fluoro-substituted benzene ring is 30.0 (1)°. In the crystal, mol­ecules are linked by N—H...N hydrogen bonds, forming chains along [010]. In addition, weak C—H...F hydrogen bonds connect chains into a two-dimensional network parallel to (001). A weak C—H...π inter­action is observed between an H atom of the benzimidazole ring sytem and the π system of the di­fluoro-substituted benzene ring.
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