crown ether

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crown ether

[′krau̇n ‚ē·thər]
(organic chemistry)
A macrocyclic polyether whose structure exhibits a conformation with a so-called hole capable of trapping cations by coordination with a lone pair of electrons on the oxygen atoms.
References in periodicals archive ?
The crown ether pores were designed to trap potassium ions, which have a positive charge.
When compared to crown ethers and cryptants, calixarenes carry metal cations from one phase to the other more selectively.
Introduction The cation selectivity of macrocyclic ligands such as crown ether and cryptands makes them excellent candidates for analytical applications.
Polythia macrocycles [62] are the thioether analogs of the crown ethers (Table 3, Compound 16).
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.
This research introduces the use of crown ethers to shield the growing chains from such unwanted interactions.
He also holds a patient on hydroxamic acid crown ethers.
Crown ethers and cryptands have high binding capacities for inorganic cations, such as [Na.sup.+], [K.sup.+], etc.
Part F includes Chapters on a New General Method for the Synthesis of O- and S-Glucosides; Chiral Crown Ethers Incorporating D-Glucose; Biomass Production of Industrial Sweet Potato as Influenced by Vesicular Arbuscular Mycorrhizal Fungal Inoculation; Mesta as a Potential Source of Carbohydrate via Organosolv Delignification; Scanning Electron Microscopic Studies of the Surface Texture of Controlled Release Matrices of Carboxymethylcellulose; Study on Thermal Degradation of Ispaghula Esters; Synthesis of Quaternary Ammonium Compounds of Hydroxyethyl Guar Gum as Catalysts for Curing of Epoxy Resins.
Rogers utilizes his diffractometer in separations research to study the structures of metal coordination spheres in inorganic complexes with crown ethers and polyethylene glycols.