title: Nonmerohedrally twinned 6-amino-3-methyluracil-5-carbaldehyde: a hydrogen-bonded ribbon containing four types of ring.
abstract: In the title compound [systematic name: 6-amino-5-formyl-3-methylpyrimidine-2,4(1H,3H)-dione], C(6)H(7)N(3)O(3), the intramolecular dimensions provide evidence for some polarization of the electronic structure. There is an intramolecular N-H...O hydrogen bond; this and a combination of three intermolecular N-H...O hydrogen bonds generate an almost planar ribbon containing S(6), R(2)(2)(4), R(2)(1)(6) and R(4)(4)(16) rings. These ribbons are linked into sheets by a dipolar carbonyl-carbonyl interaction. The structure was refined as a nonmerohedral twin, with twin fractions 0.7924 (1) and 0.2076 (10).
authors.affiliation: Departamento de Química Inorgánica y Orgánica, Universidad de Jaén, 23071 Jaén, Spain.
authors.forename: José M de la
authors.initials: JM
authors.lastname: Torre
authors.forename: Jorge
authors.initials: J
authors.lastname: Trilleras
authors.forename: Justo
authors.initials: J
authors.lastname: Cobo
authors.forename: Christopher
authors.initials: C
authors.lastname: Glidewell
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D013237:Stereoisomerism; D014498:Uracil / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: C543555:6-amino-3-methyluracil-5-carbaldehyde; D000447:Aldehydes; D014498:Uracil