Ch_322a_11.020

Ch_322a_11.020 - By encapsulating cations in a polar...

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Crown Ethers Crown ethers are cyclic polymers of ethylene glycol. HOCH 2 CH 2 OH 1,2-ethanediol (ethylene glycol) (CH 2 CH 2 O) m (O-CH 2 CH 2 ) n (-H 2 O) They are named as " X-crown-Y " where X is the total number of atoms, and Y is the number of oxygen atoms. Metal ions bind strongly in the interior in a host-gues t relationship. O O O O O O 18-crown-6 K + O O O O O O K + X - X -
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18-crown-6 O O O O O O K + Potassium ion fits nicely into the cavity of 18-crown-6.
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Unformatted text preview: By encapsulating cations in a polar environment, crown ethers allow salts to be dissolved in nonpolar solvents. There are numerous synthetic applications of this property. Crown ethers are models for naturally occurring ionophores , biological structures with numerous oxygen atoms that encapsulate and transport metal ions across cell membranes....
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_11.020 - By encapsulating cations in a polar...

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