Diiododurene: four centrosymmetric molecules in general positions.
Diiododurene (1,4-diodo-2,3,5,6-tetramethylbenzene), C(10)H(12)I(2), packs with four molecules in the asymmetric unit. All four of these moleules violate Kitaigorodsky's suggestion that molecules with centers of symmetry will lie on crystallographic centers of symmetry. There is 5.6% disorder at one of the sites. Most of the I atoms are in contact with other I atoms, but only six of the I.I contacts are shorter than 4.2 A. Of these six contacts, one set of three contacts forms a triangular set in which all of the I.I distances are less than 3.9 A.
Britton
Doyle
D
Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431, USA.
Gleason
William B
WB