An Imine-Based Molecular Cage with Distinct Binding Sites for Small and Large Alkali Metal Cations

The synthesis of a cylindrical, imine-based cage composed of two trimeric metallamacrocycles is described. The cage acts as a heterotopic receptor for alkali metal cations. The small cations Li+, Na+, and K+ bind to the outside of the cage with good selectivity for Li+, whereas the larger cations Rb+ and Cs+ are bound inside the cage to form unusual π complexes with a good selectivity for Cs+. Negative heterotopic cooperativity between the two binding sites is observed. The complexation of Cs+ is associated with a color change, which enables the cage to be used as a specific sensor for Cs+.


Published in:
Chemistry - A European Journal, 19, 6274-6281
Year:
2013
Publisher:
Weinheim, Wiley-V C H Verlag Gmbh
Keywords:
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Note: The status of this file is: EPFL only


 Record created 2013-03-20, last modified 2018-09-13

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