title: Crystal structure of tri-methyl-ammonium 5-(2,4-di-nitro-phen-yl)-1,3-dimethyl-2,6-dioxo-1,2,3,6-tetra-hydro-pyrimidin-4-olate.
abstract: The asymmetric unit of the title mol-ecular salt, C3H10N(+)·C12H9N4O7 (-) [alternative name: tri-methyl-ammonium 5-(2,4-di-nitro-phen-yl)-1,3-dimethyl barbiturate], contains one anion and two half-occupancy cations. The cations are disordered about inversion centres. The tetra-hydro-pyrimidine ring is essentially planar [maximum deviation = 0.007 (2) Å] and forms a dihedral angle of 41.12 (6)° with the plane of the benzene ring. In the crystal, N-H⋯O hydrogen bonds link the cations to the anions.
authors.affiliation: PG and Research Department of Chemistry, Seethalakshmi Ramaswami College, Tiruchirappalli 620 002, Tamil Nadu, India.
authors.forename: Sridevi
authors.initials: S
authors.lastname: Gunaseelan
authors.affiliation: PG and Research Department of Chemistry, Seethalakshmi Ramaswami College, Tiruchirappalli 620 002, Tamil Nadu, India.
authors.forename: Kalaivani
authors.initials: K
authors.lastname: Doraisamyraja
keywords: anionic σ-complexes; barbiturates; biological activity; crystal structure; tetra­hydro­pyrimidin-4-olate salt; tri­methyl­ammonium salt