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
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The crown ether pores were designed to trap potassium ions, which have a positive charge.
Introduction The cation selectivity of macrocyclic ligands such as crown ether and cryptands makes them excellent candidates for analytical applications.
The chemical structure of the multistable bis-spiropyran-containing crown ether 2-SP (Table 2, Compound 10).
Wang et al., "Structural adjustment during intercalation of macrocyclic crown ether into LDH via swelling/restoration reaction: staging formation and mechanism insights," Dalton Transactions, vol.
Moreover, trans-dinitro-dibenzo-18-6 crown ether as selective iron (III) ion ionophore was used for the functionalization of seedless grown ZnO nanorods in 3D on nickel foam substrate.
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. Crown ether-modified clay was first reported in 1978 by Ruiz-Hitzky and Casal, who reported on the stability, ion-exchange properties and other behavior of the nanocomposite materials (11).
The initial inspiration for Cram's effort was a group of compounds known as crown ethers. 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.