title: Planarity of nitro-substituted phenothiazines.
abstract: The structures of three nitro-substituted phenothiazines [1,3,4-trifluoro-2-nitrophenothiazine, 10-(4-chlorobutyl)-1,3,4-trifluoro-2-nitrophenothiazine and 10-(4-chlorobutyl)-3-nitrophenothiazine] have been determined. The first of these red compounds forms infinite stacks in the solid state, in which donor and acceptor regions of the approximately planar molecules alternate. The molecules of the other two compounds, which have folded, or 'butterfly', conformations in the solid state, do not form stacks, presumably because the bulky chlorobutyl substituents cannot be accommodated. The very dark color of solid 3-nitrophenothiazine suggests the presence of extended molecular stacks, but crystals suitable for a structure determination could not be obtained.
authors.affiliation: Department of Chemistry, University of Kentucky, Lexington, 40506-0055, USA. cpbrock@ukcc.uky.edu
authors.forename: C P
authors.initials: CP
authors.lastname: Brock
authors.forename: P J
authors.initials: PJ
authors.lastname: DeLaLuz
authors.forename: M
authors.initials: M
authors.lastname: Golinski
authors.forename: M A
authors.initials: MA
authors.lastname: Lloyd
authors.forename: T C
authors.initials: TC
authors.lastname: Vanaman
authors.forename: D S
authors.initials: DS
authors.lastname: Watt
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D008968:Molecular Conformation; D015394:Molecular Structure; D010640:Phenothiazines / Q000737:chemistry*
chemical_list: C103146:1,3,4-trifluoro-2-nitrophenothiazine; C103145:10-(4-chlorobutyl)-1,3,4-trifluoro-2-nitrophenothiazine; C103147:10-(4-chlorobutyl)-3-nitrophenothiazine; D010640:Phenothiazines