Kasthuri Balasubramani

6-(4-Methyl­phen­yl)-1,3,5-triazine-2,4-di­amine–benzoic acid (1/1)

The benzoic acid molecule of the title adduct, C10H11N5·C7H6O2, is approximately planar, with a dihedral angle of 7.2 (3)° between the carboxylic acid group and the benzene ring. In the triazine molecule, the plane of the triazine ring makes a dihedral angle of 28.85 (9)° with that of the adjacent benzene ring. In the crystal, the two components are linked by N—H⋯O and O—H⋯N hydrogen bonds with an R 2 2(8) motif, thus generating a 1 + 1 unit of triazine and benzoic acid molecules. The acid–base units are further connected by N—H⋯N hydrogen bonds with R 2 2(8) motifs, forming a supramolecular ribbon along [101]. The crystal structure also features weak π–π [centroid–centroid distances = 3.7638 (12) and 3.6008 (12) Å] and C—H⋯π interactions.

6-(4-Methyl­phen­yl)-1,3,5-triazine-2,4-di­amine–4-methyl­benzoic acid (1/1)

The 4-methylbenzoic acid molecule of the title adduct, C10H11N5·C8H8O2, is approximately planar with a dihedral angle of 6.3 (2)° between the carboxylic acid group and the benzene ring. In the triazine molecule, the plane of the triazine ring makes a dihedral angle of 29.2 (2)° with that of the adjacent benzene ring. In the crystal, the acid and base molecules are linked via N—H⋯O and O—H⋯N hydrogen bonds with an R 2 2(8) motif, and the acid–base pairs are further connected via N—H⋯N hydrogen bonds with R 2 2(8) motifs, forming a supramolecular ribbon along [101]. Between the tapes, a weak C—H⋯π interaction is observed.

4,6-Dimeth-oxy-2-(methyl-sulfan-yl)pyrimidine-4-hy-droxy-benzoic acid (1/1).

The base molecule of the title co-crystal, C7H10N2O2S·C7H6O3, is essentially planar, with a maximum deviation of 0.0806 (14) Å for all non-H atoms. The acid molecule is also nearly planar, with a dihedral angle of 8.12 (14)° between the benzene ring and the carboxy group. In the crystal, the acid molecules form an inversion dimer through a pair of O—H⋯O hydrogen bonds with an R 2 2(8) ring motif. The pyrimidine molecules are linked on both sides of the dimer into a heterotetramer via O—H⋯N and C—H⋯O hydrogen bonds with R 2 2(8) ring motifs. The heterotetramers are further linked by weak C—H⋯O hydrogen bonds, forming a tape structure along [1-10].

Crystal structure and Hirshfeld surface analysis of (E)-2-(5-bromo-2-hy­droxy­benzyl­idene)hydrazine­carbo­thio­amide di­methyl sulfoxide monosolvate

The molecule of the title Schiff base, has an E conformation with respect to the C=N bond, and a dihedral angle of 14.54 (11)° between the benzene ring and the mean plane of the N—N—C(N)=S hydrazinecarbothioamide unit.

Crystal structure, hydrogen bonding and Hirshfeld surface analysis of 2-amino-4-meth­oxy-6-methyl­pyrimidinium 4-chloro­benzoate

In the crystal structure of the title compound, C6H10N3O+·C7H4ClO2−, the pyrimidine N atom of the cation is hydrogen-bonded to the 4-chlorobenzoate anion through a pair of N—H⋯Ocarboxyl hydrogen bonds, forming an (8) ring motif which is linked through centrosymmetric (8) ring motifs, forming a pseudotetrameric DDAA array.

Crystal structure and Hirshfeld surface analysis of (E)-4-amino-N′-[1-(4-methyl­phen­yl)ethyl­idene]benzohydrazide

The title substituted benzohydrazide Schiff base compound is essentially planar, with a trans configuration between the benzene ring molecular components, while the Hirshfeld surface analysis has been used to examine the molecular interactions within the hydrogen-bonded structure

Crystal structure and Hirshfeld surface analysis of 2-amino-4-meth­oxy-6-methyl­pyrimidinium 2-hy­droxy­benzoate

Tetrameric associations of two cations and two anions occur, being linked by N—H⋯O hydrogen bonds.

Crystal structure of 2,4-di­amino-7-(hydroxy­meth­yl)pteridin-1-ium nitrate

In the crystal of the title molecular salt, C7H9N6O+·NO3 −, the cations and anions are linked via N—H⋯O and O—H⋯O hydrogen bonds, forming sheets parallel to (100). Within the sheets there are numerous hydrogen-bonding ring motifs.

2,6-Di-amino-4-chloro-pyrimidinium 4-carb-oxy-butano-ate.

In the title molecular salt, C4H6ClN4 +·C5H7O4 −, the cation is essentially planar, with a maximum deviation of 0.037 (1) Å for all non-H atoms. The anions are self-assembled through O—H⋯O hydrogen bonds, forming a supramolecular zigzag chain with graph-set notation C(8). In the crystal, the protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxylate O atoms of the anion via a pair of N—H⋯O hydrogen bonds with an R 2 2(8) ring motif. This motif further self-organizes through N—H⋯O and O—H⋯O hydrogen bonds, generating an array of six hydrogen bonds, the rings having graph-set notation R 3 2(8), R 2 2(8), R 4 2(8), R 2 2(8) and R 3 2(8). In addition, another type of R 2 2(8) motif is formed by inversion-related pyrimidinium cations via N—H⋯N hydrogen bonds, forming a two-dimensional network parallel to (101).