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A Triphasic Sorting System: Coordination Cages in Ionic Liquids
Author(s) -
Grommet Angela B.,
Bolliger Jeanne L.,
Browne Colm,
Nitschke Jonathan R.
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201505774
Subject(s) - ionic liquid , chemistry , ionic bonding , molecule , nuclear magnetic resonance spectroscopy , crystallography , ion , stereochemistry , organic chemistry , catalysis
Host–guest chemistry is usually carried out in either water or organic solvents. To investigate the utility of alternative solvents, three different coordination cages were dissolved in neat ionic liquids. By using 19 F NMR spectroscopy to monitor the presence of free and bound guest molecules, all three cages were demonstrated to be stable and capable of encapsulating guests in ionic solution. Different cages were found to preferentially dissolve in different phases, allowing for the design of a triphasic sorting system. Within this system, three coordination cages, namely Fe 4 L 6 2 , Fe 8 L 12 3 , and Fe 4 L 4 4 , each segregated into a distinct layer. Upon the addition of a mixture of three different guests, each cage (in each separate layer) selectively bound its preferred guest.