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The title salt crystallized with two anions and two cations in the asymmetric unit, together with three water molecules. In the crystal, the anions are linked via O—HO hydrogen bonds, involving the water molecules, forming chains along [100] and the cations are linked to these chains by N—HO hydrogen bonds.
organic compounds
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In the title molecular salt, C6H6N3+·C7H7O3S−, the components are linked by N—HO hydrogen bonds into zigzag chains along [100]. These chains are further connected by weak C—HO, C—Hπ and π–π (centroid-to-centroid distances = 3.510, 3.701 and 3.754 Å) interactions into a three-dimensional network.
organic compounds
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In the anion of the title salt, C2H6NO2+·C7H5O6S−, the dihedral angle between the carboxylic acid group and the benzene ring is 5.02 (12)°. In the crystal, the anions are linked into inversion dimers through pairs of O—HO hydrogen bonds between the carboxylic acid groups and sulfonate O atoms. A pair of C—HO interactions is also observed within each dimer. The anion dimers and the cations are linked into a three-dimensional network by N—HO, O—HO and C—HO hydrogen bonds.
organic compounds
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In the title 1:1 adduct, C6H5NO3·C6H5NO2, both molecules are almost planar (r.m.s. deviations for the non-H atoms = 0.027 and 0.023 Å for 4-nitrophenol and 2-carboxylatopyridinium, respectively). The pyridine molecule crystallizes as a zwitterion (nominal proton transfer from the carboxylic acid group to the N atom in the ring). In the crystal, inversion dimers of the zwitterions linked by pairs of N—HO hydrogen bonds generate R22(10) loops; two 4-nitrophenol molecules link to the dimer by O—HO hydrogen bonds, generating a four-molecule aggregate. These are linked by C—HO interactions, forming a three-dimensional network.
organic compounds
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In the title salt, C9H8NO+·C4H5O4−, the isoquinolinium ring system is approximately planar [r.m.s deviation = 0.011 (2) Å]. In the crystal, adjacent cations and anions are linked by O—HO and N—HO hydrogen bonds, forming columns along the b axis. The columns are connected by weak C—HO interactions into a three-dimensional network.