期刊
SCIENCE
卷 323, 期 5920, 页码 1461-1464出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1168679
关键词
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资金
- Fondazione Cariplo
- Academy of Finland [project 212588]
- U.S. Air Force Research Laboratory/Air Force Office of Scientific Research [Window on Europe]
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 alpha,omega-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(-)center dot center dot center dot I(CF(2))(m)I center dot center dot center dot 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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