Word Count : 246

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Crown ethers are cyclic polyethers that act as host molecules in supramolecular chemistry by selectively binding cations in their central cavity. The ability of a crown ether to accommodate a particular cation depends mainly on the size compatibility between the cavity of the crown ether and the ionic radius __________ _____ ______ ________ ___ ___ _______ ______ _____ _______ ______ ________.
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