title: 2-Amino-4,6-dimethyl-pyrimidin-1-ium 2,3,5-triiodo-benzoate 2,3,5-triiodo-benzoic acid monosolvate.
abstract: In the crystal structure of the title compound, C(6)H(10)N(3) (+)·C(7)H(2)I(3)O(2) (-)·C(7)H(3)I(3)O(2), two R(2) (2)(8) motifs are observed. One is generated by the inter-action of the 2-amino-4,6-dimethyl-pyrimidin-1-ium cation with the carboxyl-ate group of the 2,3,5-triiodo-benzoate anion via N-H⋯O hydrogen bonds. The other R(2) (2)(8) motif is formed by the inter-action of two centrosymmentrically related pyrimidine moieties through N-H⋯N hydrogen bonds. The two motifs combine to form a linear heterotetra-meric unit. Heterotetra-meric units are linked by a carbox-yl-carboxyl-ate O-H⋯O hydrogen bond (involving the O-H group of neutral 2,3,5-triiodo-benzoic acid and an O atom of the anion), forming a supra-molecular chain along the a axis. In addition, components are held by weak I⋯O interactions in the range 3.023 (5) to 3.382 (5) Å and I⋯I inter-actions in the range 3.6327 (7) to 4.0025 (8) Å.
authors.affiliation: School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu,  India.
authors.forename: Sevaiyan
authors.initials: S
authors.lastname: Malathy
authors.forename: Packianathan Thomas
authors.initials: PT
authors.lastname: Muthiah