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Metrangolo, Pierangelo; Carcenac, Yvan; Lahtinen, Manu; Pilati, Tullio; Rissanen, Kari; Vij, Ashwani; Resnati, Giuseppe
Science (American Association for the Advancement of Science), 03/2009, Letnik: 323, Številka: 5920Journal Article
Halogen bonding has increasingly facilitated the assembly of diverse host-guest solids. Here, we show that a well-known class of organic salts, bis(trimethylammonium) alkane diiodides, can reversibly encapsulate α,ω-diiodoperfluoroalkanes (DIPFAs) through intermolecular interactions between the host's I⁻ anions and the guest's terminal iodine substituents. The process is highly selective for the fluorocarbon that forms an I⁻···I(CF₂)mI···I⁻ superanion that is matched in length to the chosen dication. DIPFAs that are 2 to 12 carbons in length (common industrial intermediates) can thereby be isolated from mixtures by means of crystallization from solution upon addition of the dissolved size-matched ionic salt. The solid-state salts can also selectively capture the DIPFAs from the vapor phase, yielding the same product formed from solution despite a lack of porosity of the starting lattice structure. Heating liberates the DIPFAs and regenerates the original salt lattice, highlighting the practical potential for the system in separation applications.
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