title: Four polymorphs (polytypes) of 5,6-dimethylbenzofurazan 1-oxide.
abstract: 5,6-Dimethylbenzofurazan 1-oxide (Me2BF), C(8)H(8)N(2)O(2), occurs in four polymorphic forms that are polytypes of each other. Each polymorph of Me2BF contains molecules disordered about pseudo-twofold axes and arranged head-to-tail in ribbons, with the ribbons forming approximately planar layers held together by weak C-H···N and C-H···O interactions. Adjacent layers interact in different ways in the different polymorphs. In addition to twinning in the individual polymorphs, four examples of allotwining, that is, oriented overgrowths between different polymorphs, were found.
authors.affiliation: Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431, USA. britton@umn.edu
authors.forename: Doyle
authors.initials: D
authors.lastname: Britton
authors.forename: Victor G
authors.initials: VG
authors.lastname: Young
authors.forename: Wayland E
authors.initials: WE
authors.lastname: Noland
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Pinnow
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Clark