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In the cation of the title compound, C14H13BrN+·C7H7O3S, the dihedral angle between the benzene and pyridine rings is 8.34 (11)°. The Br atom is disordered over two positions with site occupancies of 0.74 (2) and 0.26 (2). The mol­ecular structure is stabilized by a weak intra­molecular C—H...O inter­actions. The crystal structure exhibits weak C—H...O and π–π [centroid–centroid distance = 3.7466 (17) Å] inter­actions, forming a three dimensional network.

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In the title mol­ecular salt, C18H22NO+·C7H7O3S, the dihedral angle between the aromatic rings in the cation is 10.00 (9)°; its alkyl side chain adopts an extended conformation. In the crystal, weak C—H...O and π–π [centroid–centroid distance = 3.7658 (17) Å] inter­actions link the components, generating a three-dimensional network.

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In the title hydrated salt, C6H7N2O2+·C7H5O6S·H2O, the benzene ring of the cation makes a dihedral angle of 1.32 (19)° with the attached nitro group. In the anion, an intra­molecular O—H...O hydrogen bond with an S(6) ring motif is formed between the carb­oxyl and hy­droxy groups; the dihedral angle between the carb­oxyl group and the benzene ring is 8.76 (8)°. The crystal structure exhibits inter­molecular N—H...O, O—H...O, C—H...O, and π–π [centroid–centroid distances = 3.6634 (9) and 3.7426 (9) Å] inter­actions to form a three-dimensional network.

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In the title compound, CH5N2O+·C7H5O6S, the dihedral angle between the benzene ring and the mean plane of the uronium cation is 76.02 (8)°. The carboxyl group in the anion is twisted by 1.47 (9)° from the benzene ring. In the crystal, the cation is linked to the anion by weak O—H...O and N—H...O hydrogen bonds and π–π inter­actions [centroid–centroid distance = 3.8859 (8) Å], forming a three-dimensional network.
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