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The title compound, C24H19ClN2, crystallizes with two independent mol­ecules in the asymmetric unit. The prop-2-enyl substituents on the imidazole rings adopt similar conformations in the two mol­ecules. The 4-and 5-substituted phenyl rings and the benzene ring make dihedral angles of 67.06 (8), 5.61 (8) and 41.09 (8)°, respectively, with the imadazole ring in one mol­ecule and 71.53 (8), 28.85 (8) and 41.87 (8)°, respectively, in the other. The crystal structure features C—H...π inter­actions and weak π–π stacking inter­actions [centroid–centroid distances = 3.6937 (10) and 4.0232 (10) Å] between the chloro­phenyl rings, which form a three-dimensional supramolecular structure.

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The asymmetric unit of the title compound, C16H13N3O3·0.5C2H6OS, is composed of two independent pyrazolidine-3,5-dione mol­ecules and one dimethyl sulfoxide solvent mol­ecule. In each pyrazolidine-3,5-dione mol­ecule, an intra­molecular N—H...O hydrogen bond forms an S(5)S(6) motif. In the crystal, pairs of each independent pyrazolidine-3,5-dione mol­ecule are linked by N—H...O hydrogen bonds, forming dimers with R22(8) motifs. These dimers are connected with the other mol­ecules through the solvent mol­ecules via O—H...O hydrogen bonds, forming ribbons along the b-axis direction. C—H...π inter­actions connect the ribbons. C—H...O interactions also occur.

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The asymmetric unit of the title salt, C8H10N5+·C7H7O3S, consists of two amino­[(1H-benzimidazol-2-yl)amino]­meth­an­im­inium cations and two 4-methyl­benzene­sulfonate anions. The cations are each stabilized by intra­molecular N—H...N hydrogen bonds between the free amino groups and the imine N atoms of the benzimidazole units, forming S(6) ring motifs. In the crystal, cations and anions are linked by N—H...O and C—H...O hydrogen bonds, forming a three-dimensional supra­molecular framework. Two strong π–π stacking inter­actions [centroid–centroid distances = 3.4112 (14) and 3.4104 (14) Å] also occur between the centroids of the imidazole rings of like cations.

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In the title compound, C20H20N2O3, the central 2,5-di­hydro-1H-pyrrole ring [r.m.s. deviation = 0.014 (1) Å] is oriented at dihedral angles of 77.81 (6) and 25.33 (6)°, respectively, to the attached phenyl ring and the aniline phenyl ring. An intra­molecular N—H...O hydrogen bond occurs. In the crystal, mol­ecules are linked through pairs of N—H...O hydrogen bonds, forming inversion dimers with an R22(10) ring motif. Two weak C—H...π inter­actions are also observed.

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In the title compound, C20H18Cl2N2O3, the dihedral angles between the central 2,5-di­hydro-1H-pyrrole ring and the phenyl rings are 74.87 (9) and 29.09 (9)°. Intra­molecular N—H...O and C—H...O hydrogen bonds occur. In the crystal, pairs of N—H...O hydrogen bonds link adjacent mol­ecules into inversion dimers and form an R12(6)R22(10)R12(6) ring motif through C—H...O hydrogen bonds.
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