Acta Cryst. (2013). E69, o328-o329
[ doi:10.1107/S1600536813001888 ]

The halogen-bonded adduct 1,4-bis(pyridin-4-yl)buta-1,3-diyne-1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8-hexadecafluoro-1,8-diiodooctane (1/1)

G. Cavallo, G. Marras, P. Metrangolo, T. Pilati and G. Terraneo

Abstract: In the crystal structure of the title compound, C₈F₁₆I₂·C₁₄H₈N₂, the molecules form infinite chains parallel to [2-11] through two symmetry-independent C-IN halogen bonds (XBs). As commonly found, the perfluoroalkyl molecules segregate from the hydrocarbon ones, forming a layered structure. Apart from the XBs, the only contact below the sum of van der Waals radii is a weak HF contact. The topology of the network is a nice example of the paradigm of the expansion of ditopic starting modules; the XB leads to the construction of infinite supramolecular chains along [2-11] formed by alternating XB donors and acceptors.

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