crown ether


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crown ether

n
(Chemistry) chem a type of cyclic ether consisting of a ring of carbon and oxygen atoms, with two or more carbon atoms between each oxygen atom
References in periodicals archive ?
Introduction The cation selectivity of macrocyclic ligands such as crown ether and cryptands makes them excellent candidates for analytical applications.
In the metal-organic framework developed by Stephen Loeb's group at the University of Windsor, circular crown ether 'wheels' (represented by yellow toruses) are able to spin around organic 'axles' connected by complexes of copper (brown spheres).
Second up are another local four-piece STILL ACTIVE who will be going on immediately before alternative indie/rock band CROWN ETHER who have a touch of the 90s Radiohead about them.
Among the more colorfully named techniques are supercritical fluid chromatography, ligand exchange, simulated moving bed chromatography, and chiral crown ether stationary phases.
Another possible modification is to render the alkali metal cation organophiic by complexation with a crown ether.
A typical crown ether consists of a carbon-atom ring with oxygen atoms strategically placed at certain positions.
The enhancement of O2-binding and catalytic oxidation activities by the oxa aza crown ether ring of the cobalt complexes as well as the complexed alkali metal and alkaline-earth metal ions were discussed.
Cyclodextrins and crown ethers are widely used as adsorbent or ligands in these methods.
Candidate binding groups include aliphatic quaternary amines, organophosphate complexing agents, chelating agents, crown ethers or antibodies.
Coverage encompasses cyclophnes; crown ethers, cryptands, and other compounds; calixarenes; heterocalixaresn and calixnaphthalenes; cyclodextrins; cyclotriveratylenes and cryptophnes; cucurbiturils; rotaxanes and catemanes; and other supramolecular systems, molecular motors, machines, and nanotechnological applications.