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In the title compound, 2C11H18N+·2PF6·C12H24O6, the 18-crown-6 mol­ecule has crystallographically imposed inversion symmetry. In the crystal, it inter­acts with the cation through weak C—H...O hydrogen bonds. The cations and anions are further linked via N—H...F and C—H...F hydrogen bonds, leading to a sandwich structure .

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In the crystal structure of the title compoud, C14H18BrNO4, mol­ecules are linked by a strong O—H...O hydrogen bond and weaker C—H...O inter­actions. The benzene ring makes dihedral angles of 3.67 (3) and 72.63 (3)° with the carb­oxy­lic acid group and the nitro group, respectively.

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The title mol­ecule, C35H25N3O, is a tri­phenyl­amine derivative with the 4-position substituted by an aldehyde group, and the 4'-position substituted by a 6-phenyl-2,2'-bi­pyridine group. The whole mol­ecule is non-planar and the dihedral angle between the core benzene and pyridine rings is 36.96 (5)°. The dihedral angle between the phenyl and benzaldehyde groups bonded to the amine N atom is 70.86 (5)°.

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In the title compound, C10H9N3O3S, the five-membered ring adopts a slightly twisted conformation about the Cm—S (m = methyl­ene) bond. The dihedral angle between this ring and the benzene ring is 7.99 (9)°. A bifurcated intra­molecular N—H...(O,S) hydrogen bond helps to establish the near planar conformation of the mol­ecule. In the crystal, mol­ecules are linked by N—H...O and O—H...O hydrogen bonds to generate (001) sheets.
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