D-Phenyl­glycinium bromide

In the crystal of the title salt, C₈H₁₀NO₂⁺·Br⁻, the bromide anions and the phenylglycinium cations are ­linked through N—H...Br, O—H...Br and C—H...O hydrogen bonds, generating sheets lying parallel to (001).

L-Histidinium p-toluene­sulfonate

In the title salt, C₆H₁₀N₃O₂⁺·C₇H₇O₃S⁻, the imidazole ring makes a dihedral angle of 70.93 (12)° with the plane of the toluene ring. In the crystal, the ions are linked via N—H...O and weak C—H...O hydrogen bonds forming two-dimensional networks lying parallel to (001). These networks are linked via C—H...π inter­actions, forming a three-dimensional structure.

2-Amino-4-methyl­pyridinium 2-nitro­benzoate

In the title mol­ecular salt, C₆H₉N₂⁺·C₇H₄NO₄⁻, the original pyridine N atom of 2-amino-4-methyl­pyridine is protonated and the carb­oxylic acid group of nitro­benzoic acid is deprotonated. In the crystal, the ions are linked by N—H...O hydrogen bonds, forming chains propagating along [001]. The chains are linked via C—H...O hydrogen bonds, forming two-dimensional networks lying parallel to the bc plane.

3-Hy­droxy­anilinium p-toluene­sulfonate

The asymmetric unit of the title salt, C₆H₈NO⁺·C₇H₇O₃S⁻, contains two cations and two anions. In the crystal, the cations and anions are linked through extensive N—H...O and O—H...O hydrogen-bonding inter­actions, which result in R₄⁴(18) and R₂¹(4) ring motifs, forming a three-dimensional network.

Bis(2-hy­droxy­eth­yl)ammonium picrate

The asymmetric unit of the title salt, C₄H₁₂NO₂⁺·C₆H₂N₃O₇⁻, contain two bis­(2-hy­droxy­eth­yl)ammonium cations and two picrate anions. An intra­molecular N—H...O hydrogen bond occurs in each cation. In the crystal, mol­ecules are linked via O—H...O and N—H...O hydrogen bonds, which generate two R₂¹(6), an R₂²(10) and an R₂²(13) graph-set ring motifs. There are also a number of C—H...O hydrogen bonds present. The sum of these inter­actions leads to the formation a three-dimensional structure.