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In the crystal structure of the title compound, C20H38N22+·2Br, the centroid of the aromatic ring is located on an inversion center, so that the asymmetric unit consists of one-half mol­ecule of the dication and one bromide anion. C—H...Br inter­actions connect the two components into a three-dimensional network. An intra­molecular C—H...π inter­action is also observed.

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In the title compound, C9H14N2O2, the imidazole ring and the acetate O—C=O plane make a dihedral angle of 80.54 (12)°. In the crystal, mol­ecules are connected via pairs of C—H...O hydrogen bonds, forming centrosymmetric dimers.

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In the title compound, C13H16N2O2, the planes of the benzimidazole ring system and the acetate O—C=O fragment make a dihedral angle of 84.5 (3)°. In the crystal, mol­ecules are connected through C—H...N hydrogen bonds to form infinite chains in the [-110] direction.

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The asymmetric unit of the title compound, C20H28N2O6S2, contains one half-mol­ecule, related to the other half by a twofold rotation axis. The two aromatic rings of the mol­ecule make a dihedral angle of 50.91 (7)°. The O—CH2—CH2—O and N—CH2—CH2—O fragments both adopt gauche conformations, with torsion angles of 76.0 (4) and 70.4 (3)°, respectively. In the crystal, adjacent mol­ecules are linked through N—H...O hydrogen bonds into chains along the a-axis direction. The chains are further connected via C—H...O inter­actions into a two-dimensional supra­molecular network in the ac plane.
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