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The asymmetric unit of the title salt, C 7 H 8 N 3 + ·C 7 H 5 O 6 S - , comprises two 1,3-di-hydro-2 H -benzimidazol-2-iminium cations and two 2-hy-droxy-5-sulfobenzoate anions ( Z ' = 2). In the crystal, the mol-ecules inter-act through N-H⋯O, O-H⋯O hydrogen bonds and C-O⋯π contacts. The hydrogen-bonding inter-actions lead to the formation of layers parallel to (01). Hirshfeld surface analysis revealed that H⋯H contacts contribute to most of the crystal packing with 38.9%, followed by H⋯O contacts with 36.2%., (© Mukhammadiev et al. 2024.)

The organic-inorganic complex salt, (C 8 H 10 N 3 ) 3 [La(NO 3 ) 6 ], comprises a network of N-protonated 2-amino-1-methyl-benzimidazolium cations and hexa-kis-(nitrato)lanthanate(III) anions. The La III atom is twelve-coordinate within a distorted icosa-hedral environment. In the unit cell, each pair of the La III atoms lie nearly on one of the crystallographic glide planes. In the crystal structure, there are several N-H⋯O hydrogen-bonding inter-actions between the cations and terminal oxygen atoms from the nitrate moieties of the [La(NO 3 ) 6 ] 3- anion. Additional weak C-H⋯O hydrogen bonds between the cations and anions consolidate the three-dimensional arrangement of the structure. A packing analysis was performed to check the strength of the crystal packing., (© Ruzieva et al. 2022.)

In the anion of the title mol-ecular salt, C7H7N2 (+)·C7H5O3 (-) (systematic name: 1H-benzimidazol-3-ium 2-hy-droxy-ben-zo-ate), there is an intra-molecular O-H⋯O hydrogen bond that generates an S(6) ring motif. The CO2 group makes a dihedral angle of 5.33 (15)° with its attached ring. In the crystal, the dihedral angle between the benzimidazolium ring and the anion benzene ring is 75.88 (5)°. Two cations bridge two anions via two pairs of N-H⋯O hydrogen bonds, enclosing an R (4) 4(16) ring motif, forming a four-membered centrosymmetric arrangement. These units are linked via C-H⋯O hydrogen bonds, forming chains propagating along the b-axis direction. The chains are linked by C-H⋯π and π-π inter-actions [inter-centroid distances = 3.4156 (7) and 3.8196 (8) Å], forming a three-dimensional structure.