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In the title molecular salt, C5H12N+·C6H4NO3−, the piperidine ring adopts a chair conformation and the cation is protonated at the N atom. In the anion, the nitro group is twisted at an angle of 10.30 (11)° with respect to the attached benzene ring. In the crystal, N—H...O hydrogen bonds link adjacent anions and cations into infinite chains propagating along [100]. The chains are linked by C—H...π interactions, forming sheets lying parallel to (001).

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The title mol­ecular salt, C8H12N+·C4H3O4 −, crystallized with two independent cations and anions in the asymmetric unit. The ethanaminium side chains of the cations exhibit anti conformations [C—C—C—N torsion angles = 176.5 (3) and −179.4 (3)°]. In the crystal, N—H⋯O and C—H⋯O hydrogen bonds connect adjacent anions and cations, and , O—H⋯O hydrogen bonds connect adjacent anions, generating sheets parallel to (001).

No abstract