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The asymmetric unit of the title 1:1 adduct, C 10 H 8 N 2 S·C 6 F 4 I 2 , comprises a half-mol­ecule of 1,2,4,5-tetra­fluoro-3,6-diiodo­benzene, and half a 4-(pyridin-4-ylsulfan­yl)pyridine mol­ecule. The former is completed by crystallographic inversion symmetry, the latter by twofold symmetry, with the S atom lying on the rotation axis. The almost planar 1,2,4,5-tetra­fluoro-3,6-diiodo­benzene mol­ecule (r.m.s. deviation of all 12 atoms = 0.016 Å) and twisted 4-(pyridin-4-ylsulfan­yl)pyridine mol­ecule [dihedral angle between pyridyl rings = 54.88 (13)°] are connected by N⋯I inter­actions [2.838 (4) Å], generating a supra­molecular chain with a step-ladder topology. These chains are connected in the crystal by C—H⋯F and C—H⋯π(pyrid­yl) inter­actions.

1,2,4,5-Tetrafluoro-3,6-diiodobenzene–4-(pyridin-4-ylsulfanyl)pyridine (1/1)