Cyclo­hexa-2,5-diene-1,4-dione–1,2,4,5-tetra­fluoro-3,6-diiodo­benzene (1/1)

The asymmetric unit of the title co-crystal adduct, C₆H₄O₂·C₆F₄I₂, comprises a half-mol­ecule each of cyclo­hexa-2,5-diene-1,4-dione and 1,2,4,5-tetra­fluoro-3,6-diiodo­benzene. The C₆F₄I₂ mol­ecule is almost planar (r.m.s. deviation = 0.0062 Å). In the crystal, the components are connected through O...I halogen bonds [3.017 (11) Å], leading to the formation of wavelike chains along the a axis. The crystal packing also features C—H...F inter­actions.

2,4-Diiodo-3-nitro­anisole

In the title compound (systematic name: 1,3-diiodo-4-meth­oxy-2-nitro­benzene), C₇H₅I₂NO₃, the dihedral angle between the benzene ring and the nitro group is 88.0 (3)°, and the methyl group lies almost in the same plane as the ring [deviation = 0.034 (6) Å]. In the crystal, aromatic π–π stacking occurs between inversion-related rings [centroid–centroid separation = 3.865 (3) Å and slippage = 0.642 Å]. A possible weak C—I...π inter­action occurs [I...π = 3.701 (2) Å and C—I...π = 130.18 (13)°], but there are no significant inter­molecular I...I contacts.