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 of the cation, along with the nature of electrostatic interactions and coordination ___ ____ _________ ____ _______.
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