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4,4'-Di­iodo­bi­phenyl, C12H8I2, crystallizes as a homologous isomorph of the high-temperature form of p-di­iodo­benzene. The molecule is planar and lies on a center of symmetry. Each I atom is in contact with five others at distances between 4.0 and 4.5 Å.

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2,3,5,6-Tetra­chloro-1,4-di­cyano­benzene forms a 1:1 complex with anthracene, C8N2Cl4·C14H10. The two mol­ecules, which both lie on inversion centers, alternate in π stacks. There are no unusual intermolecular interactions.

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2,6-Di­bromo-4-chloro­benzo­nitrile, C7H2Br2ClN, forms layers in the crystal structure, with Br...N contacts of 3.049 (2) Å the strongest intermolecular interactions. The crystal structure is isomorphous with 2,4,6-tri­bromo­benzo­nitrile.

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In the crystal structure of the title compound, 2,4,5,6-tetra­chloro-1,3-dicyano­benzene–pyrene (1/1), C8Cl4N2·C16H10, the dicyano­benzene mol­ecules located on twofold rotation axes of symmetry and the pyrene mol­ecules on inversion centers. The primary inter­molecular inter­action is in an alternate π-stacked arrangement. There are no unusual inter­actions between the stacks.
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