title: Orthorhombic and monoclinic polymorphs of 1,3,5-triphenylperhydro-1,3,5-triazine-2,4,6-trione at 120 K: chains and sheets formed by C-H...pi(arene) hydrogen bonds.
abstract: The title compound, C21H15N3O3, crystallizes in two polymorphic forms. In the orthorhombic polymorph, (I), in space group Fdd2 with Z' = 1, the molecules lie in general positions, while in the monoclinic polymorph, (II), in space group C2/c with Z' = 1/2, the molecules lie across twofold rotation axes. In each polymorph, the molecules are linked by a single C-H.pi(arene) hydrogen bond, forming chains in polymorph (I) and sheets in (II).
authors.affiliation: Department of Chemistry, Bharathidasan University, Tiruchirappalli, Tamil Nadu 620 024, India.
authors.forename: M Baby
authors.initials: MB
authors.lastname: Mariyatra
authors.forename: Krishnaswamy
authors.initials: K
authors.lastname: Panchanatheswaran
authors.forename: John N
authors.initials: JN
authors.lastname: Low
authors.forename: Christopher
authors.initials: C
authors.lastname: Glidewell