Host---Guest Complexes of Crown Ethers and

Host-Guest Complexes of Crown Ethers and Cryptands. - The complexation of primary alkylammonium salts by macrocyclic multidentate compounds has been reviewed.  

Cryptands have been used for the separation of isotopes Ca and Ca have been separated, using [2.2.1] and [2.2.2], the lighter isotope being enriched in the organic phase.Similarly, preliminary results on the separation of Na and Na, using [2.2.1 ], are promising.  

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Most of the organometallic host-guest complexes of crown ethers and cryptands contain main group organometallic compounds. 

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