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In the crystal structure of the title compound, C13H11NO5S, the dihedral angle between the mean planes of the 4-tolyl and 4-nitro­phenyl rings is 82.52 (4)°. There are weak C—H...O interactions, which generate rings of graph-set motifs S(5), S(6), R_{2}^{1}(5), R_{2}^{1}(6) and R_{2}^{1}(9). The supramolecular aggregation is completed by the presence of C—H...π and van der Waals interactions.

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In the crystal structure of the title compound, C13H11NO5S, the dihedral angle between the mean planes of the 4-tolyl and 2-nitro­phenyl rings is 42.2 (2)°. There are weak C—H...O hydrogen bonds, which generate rings of graph-set motifs S(5), R_{1}^{2}(4), R_{2}^{1}(5), R_{2}^{1}(6), R_{1}^{2}(6), R_{2}^{2}(7) and R_{2}^{2}(10). The supramol­ecular aggregation is completed by the presence of intermolecular van der Waals short contacts, and C—H...π and π–π interactions.

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In the crystal structure of the title compound, C14H14O3S, the dihedral angle between the planes of the two benzene rings is 45.51 (5)°. There are weak C—H...O hydrogen bonds which generate rings of graph-set motifs S(5), S(6) and R21(6). The supramolecular aggregation is completed by the presence of C—H...π and π–π interactions.

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In the crystal structure of the title compound, C14H14O3S, the dihedral angle between the mean planes of the two rings is 51.97 (8)°. There are weak C—H...O hydrogen bonds which generate rings of graph-set motifs S(5), S(6), R12(4) and R21(9). The supramolecular aggregation is completed by the presence of C—H...π interactions.

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In the crystal structure of the title compound, C17H14O3S, the dihedral angle between the mean planes of the 4-tolyl and 1-naphthyl rings is 45.05 (4)°. The supramolecular aggregation is completed by the presence of intermolecular C—H...O and C—H...π interactions.

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In the crystal structure of the title compound, C13H12O3S, the dihedral angle between the mean planes of the 4-tolyl and phenyl rings is 52.6 (1)°. There are weak C—H...O hydrogen bonds, which generate rings of graph-set motifs R12(4) and R21(9). The supramolecular aggregation is completed by the presence of van der Waals short contacts and C—H...π interactions.

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The title compound, C21H21N2O+·Br·0.5H2O, crystallizes in a monoclinic unit cell with two cations, two anions and one water mol­ecule in the asymmetric unit. The conformations of the two independent cations are different. The crystal packing is stabilized by O—H...Br and C—H...Br interactions and weak intermolecular C—H...O hydrogen bonds.

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In the crystal structure of the title compound, C13H11BrO3S, the dihedral angle between the mean planes of the 4-tol­yl and 4-bromo­phen­yl rings is 67.3 (2)°. There are weak C—H...O hydrogen bonds which generate rings of graph-set motifs S(5), S(6), R12(4), R21(6) and R22(8). The supramolecular aggregation is completed by the presence of C—H...π inter­actions. An R22(7) motif formed by the combination of a C—H...O and a C—H...π inter­action is a notable feature in the title compound.
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