Abstract
This year marks the 25th anniversary of the discovery of crown ethers by C. J. Pedersen (see Mary R. Truter and C. J. Pedersen Endeavour, 30, 142, 1971). This article reviews some new developments in this important field. New crown ether and related ligand systems that contain organometallic redoxactive groups can complex and electrochemically detect cations (metals, ammonium) and anions (halide, nitrate) in polar solvents. Thus, they represent prototypes of novel molecular sensory devices of the future.
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