1:1 complexes of 2,3,5,6-tetrachlorobenzene-1,4-dicarbonitrile with pyrene and phenanthrene: pseudo-isomorphs.
2,3,5,6-Tetrachlorobenzene-1,4-dicarbonitrile forms alternate pi-stacked 1:1 complexes with pyrene, C(8)Cl(4)N(2).C(16)H(10), and phenanthrene, C(8)Cl(4)N(2).C(14)H(10). These complexes are pseudo-isomorphs. Phenanthrene, disordered about a centre of symmetry, takes the position of the pyrene, which sits exactly on this centre of inversion. The tetrachlorobenzenedicarbonitrile molecules in each complex also sit on centres of inversion and are in similar positions within the unit cells in the two structures, except that the orientation of the nitrile groups differs between the two.
Britton
Doyle
D
Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431, USA. britton@chem.umn.edu