title: 1,4-Bis(hex-yloxy)-2,5-diiodo-benzene.
abstract: The centrosymmetric title compound, C(18)H(28)I(2)O(2), crystallized in the monoclinic space group P2(1)/c with the alkyl chains having extended all-trans conformations, similar to those in the centrosymmetric bromo analogue [Li et al. (2008 ▶). Acta Cryst. E64, o1930] that crystallized in the triclinic space group P. The difference between the two structures lies in the orientation of the two alkyl chains with respect to the C(aromatic)-O bond. In the title compound, the O-C(alk-yl)-C(alk-yl)-C(alk-yl) torsion angle is 55.8 (5)°, while in the bromo analogue this angle is -179.1 (2)°. In the title compound, the C-atoms of the alkyl chain are almost coplanar [maximum deviation of 0.052 (5) Å] and this mean plane is inclined to the benzene ring by 50.3 (3)°. In the bromo-analogue, these two mean planes are almost coplanar, making a dihedral angle of 4.1 (2)°. Another difference between the crystal structures of the two compounds is that in the title compound there are no halide⋯halide inter-actions. Instead, symmetry-related mol-ecules are linked via C-H⋯π contacts, forming a two-dimensional network.
authors.forename: Damien
authors.initials: D
authors.lastname: Thevenet
authors.forename: Reinhard
authors.initials: R
authors.lastname: Neier
authors.forename: Olha
authors.initials: O
authors.lastname: Sereda
authors.forename: Antonia
authors.initials: A
authors.lastname: Neels
authors.forename: Helen
authors.initials: H
authors.lastname: Stoeckli-Evans