title: 1,2-Diiodo-4,5-dimethyl-benzene.
abstract: The structure of the title compound, C(8)H(8)I(2), conforms closely to the mm2 symmetry expected for the free mol-ecule and is the first reported structure of a diiodo-dimethyl-benzene. Repulsion by neighboring I atoms and the neighboring methyl groups opposite to them results in a slight elongation of the mol-ecule along the approximate twofold rotation axis that bis-ects the ring between the two I atoms. In the extended structure, the mol-ecules form inversion-related pairs which are organized in approximately hexa-gonal close-packed layers and the layers then stacked so that mol-ecules in neighboring layers abut head-to-tail in a manner that optimizes dipole-dipole inter-actions.
authors.affiliation: Department of Chemistry, Southeast Missouri State University, Cape Girardeau, Missouri 63701, USA.
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Hathaway
authors.forename: Uriah J
authors.initials: UJ
authors.lastname: Kilgore
authors.forename: Marcus R
authors.initials: MR
authors.lastname: Bond