title: Bromine-bromine interactions in the packing of cis,trans,cis-1,2,3,4-tetrakis(bromomethyl)cyclobutane.
abstract: The title compound, C8H12Br4, displays crystallographic inversion symmetry, so that the cyclobutane ring is exactly planar. The ring C-C bond with eclipsed substituents is lengthened somewhat to 1.572 (5) Å. The packing can be described in terms of three Br...Br contacts; two of these combine to form layers of molecules parallel to the ac plane, while the third crosslinks the layers in the third dimension. A simple topological descriptor for systems involving Br···Br contacts is proposed.
authors.affiliation: Institut für Organische Chemie, Technische Universität Braunschweig, Postfach 3329, D-38023 Braunschweig, Germany.
authors.forename: André
authors.initials: A
authors.lastname: Kelch
authors.forename: Ina
authors.initials: I
authors.lastname: Dix
authors.forename: Henning
authors.initials: H
authors.lastname: Hopf
authors.forename: Peter G
authors.initials: PG
authors.lastname: Jones