Co-crystals formed from pyridyl bis-urea macrocycles and iodopentafluorobenzene or diiodotetrafluoroethane show surprisingly short, strong halogen bonds. The shortest interactions were observed between the carbonyl oxygen and the iodide and were 78% of the sum of the van der Waals radii for O⋯I, with distances ranging from 2.719(2) to 2.745(2) Å.
M. F. Geer, J. Mazzuca, M. D. Smith and L. S. Shimizu, CrystEngComm, 2013, 15, 9923 DOI: 10.1039/C3CE41413B
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