89488-56-2Relevant articles and documents
5-Iodobenzofurazan 1-oxide: Polymorphs, pseudosymmetry and disorder
Britton, Doyle,Noland, Wayland E.,Clark, Christopher M.
, p. o187-o190 (2008)
5-Iodo-benzofurazan 1-oxide (systematic name: 5-iodo-benzo-1,2,5-oxadiazole 1-oxide), C6H3IN2O2, occurs in two polymorphic forms, both monoclinic in P21/c with Z′ = 2. The inter-molecular inter-actions in the two polymorphs are quite different. In polymorph (I), there are strong inter-molecular I...O inter-actions, with I...O distances of 3.114 (8) and 3.045 (8) A. In polymorph (II), there are strong inter-mol-ecular I...N inter-actions, with I...N distances of 3.163 (4) and 3.175 (5) A. In (I), there is about 15% disorder in one mol-ecule and about 5% in the other. In both polymorphs, there are pseudosymmetric relationships between the crystal-log-raphically independent mol-ecules.