Two new cocrystals of 1,4-diazabicyclo[2.2.2]octane (DABCO, CHN) with 1,2-diiodoethene (1,2-CHI) and 1,2-diiodoethane (1,2-CHI) complete a series of halogen-bond-assisted cocrystals which started with DABCO·CI [Perkins et al. (2012). CrystEngComm, 14, 3033-3038]. The structural and computational analysis of this series illustrate the correlation between the polarization of the I atom and the hybridization of the C atom bound to it. The formation of a rather stable halogen bond by the alkylic iodide of saturated 1,2-CHI was unusual and respective cocrystals are formed only in nonpolar solvents, while, in the polar medium of acetonitrile, a very intense reaction of DABCO quaternization takes place resulting in 1-(2-iodoethyl)-4-aza-1-azoniabicyclo[2.2.2]octane triiodide, CHIN·I or [N(CHCH)N-CHCHI][I].
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