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In the title molecular salt, C6H6N3+·C7H7O3S, the components are linked by N—H...O hydrogen bonds into zigzag chains along [100]. These chains are further connected by weak C—H...O, C—H...π and π–π (centroid-to-centroid distances = 3.510, 3.701 and 3.754 Å) inter­actions into a three-dimensional network.

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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—H...O hydrogen bonds between the carb­oxy­lic acid groups and sulfonate O atoms. A pair of C—H...O inter­actions is also observed within each dimer. The anion dimers and the cations are linked into a three-dimensional network by N—H...O, O—H...O and C—H...O hydrogen bonds.

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In the title salt, the piperidine ring of the cation adopts a chair conformation. In the crystal, N—H...O hydrogen bonds link adjacent anions and cations into infinite chains along [100]. The chains are linked by C—H...π inter­actions, forming sheets lying parallel to (001).

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In the title hydrated mol­ecular salt, C8H12N+·C6H4NO3·H2O, the conformation of the side chain in the cation is anti [C—C—C—N = 179.62 (12)°] and the dihedral angle between the aromatic ring and the nitro group in the anion is 3.34 (11)°. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds, generating (10-1) sheets, which feature R44(21) loops. The sheets inter­act by weak aromatic π–π stacking inter­actions [centroid–centroid distance = 3.896 (3) Å], forming a three-dimensional network.
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