organic compounds
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The title compound, C15H15NO4S, was obtained by the condensation of 4-aminoacetophenone and 4-methoxybenzenesulfonyl chloride. The dihedral angle between the benzene rings is 86.56 (9)° and the molecule has an approximate V-shaped conformation. The C atom of the methoxy group is roughly coplanar with its attached ring [deviation = 0.177 (3) Å], as is the methyl C atom of the acetyl group with its ring [deviation = 0.065 (2) Å]. An intramolecular C—HO interaction generates an S(6) ring. In the crystal, N—HO and C—HO hydrogen bonds link the molecules into [010] chains. Weak C—Hπ interactions are also observed.
organic compounds
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In the title mixed salt, 2C16H15N2+·C6H4ClO3S−·NO3−, one of the cations shows whole molecule disorder over two sets of sites in a 0.711 (7):0.289 (7) ratio. The 4-chorobenzenesulfonate anion is also disordered over two orientations in a 0.503 (6):0.497 (6) ratio. The cations are close to planar, the dihedral angles between the pyridinium and indole rings being 1.48 (3)° in the ordered cation, and 5.62 (3) and 2.45 (3)°, respectively, for the major and minor components of the disordered cation. In the crystal, the cations are stacked in an antiparallel manner approximately along the a-axis direction and linked with the anions via N—HO hydrogen bonds and C—HO interactions, generating a three-dimensional network. Weak C—Hπ and π–π interactions [with centroid–centroid distances of 3.561 (2)–3.969 (7) Å] are also observed.
organic compounds
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In the structure of the title nicotinonitrile derivative, C19H15N3O, the pyridine ring makes dihedral angles of 11.50 (7) and 43.36 (8)° with the 4-aminophenyl and phenyl rings, respectively, and the dihedral angle between the phenyl rings is 36.28°. In the crystal, molecules are linked by N—HN hydrogen bonds into wave-like sheets parallel to (10-2). These sheets are stacked by π–π interactions between the 4-aminophenyl rings of adjacent sheets, with centroid–centroid distances of 3.7499 (9) Å. C—Hπ interactions are also present.
organic compounds
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The title salt crystallized as the monohydrate C15H16NO2+·C6H4BrSO3−·H2O. The cation exists in an E conformation with respect to the ethynyl bond and is essentially planar, with a dihedral angle of 6.52 (14)° between the pyridinium and the benzene rings. The hydroxy and methoxy substituents are coplanar with the benzene ring to which they are attached, with an r.m.s. deviation of 0.0116 (3) Å for the nine non-H atoms [Cmethyl—O—C—C torsion angle = −0.8 (4)°]. In the crystal, the cations and anions are stacked by π–π interactions, with centroid–centroid distances of 3.7818 (19) and 3.9004 (17) Å. The cations, anions and water molecules are linked by O—HO hydrogen bonds and weak C—HO interactions, forming a three-dimensional network.