The asymmetric unit of the title compound, C6H8N+·HSO4 −, contains two cations and two anions which are linked to each other through N—H⋯O hydrogen bonds, formed by all H atoms covalently bonded to the N atoms. In addition, strong O—H⋯O anion–anion hydrogen-bond inter­actions are also observed.

Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.030; wR factor = 0.099; data-to-parameter ratio = 18.5.In the title compound, C 6 H 8 NO + ÁHSO 4 À , there is an intricate cation-cation, cation-anion and anion-anion three-dimensional hydrogen-bond network. Refinement R[F 2 > 2(F 2 )] = 0.030 wR(F 2 ) = 0.099 S = 1.14 2241 reflections 121 parameters 1 restraint H-atom parameters constrained Á max = 0.32 e Å À3 Á min = À0.45 e Å À3 Absolute structure: Flack (1983), with 1095 Friedel pairs Flack parameter: À0.02 (8) organic compounds

The asymmetric unit of the title compound, C7H10N+·NO3 −, consists of a 4-methyl­anilinium cation protonated at the amino group and a nitrate anion. In the crystal, anions and cations are linked through N—H⋯O and N—H⋯(O,O) hydrogen bonds, buiding a corrugated layer structure parallel to (001).

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