Study of Complexation Behavior of Some Benzocrown Ether Derivatives by Solvent Extraction with Organic Salts of Alkaline Earth Metal Ions

Crown ethers are lipophilic hosts, which can include cations, especially alkali and alkaline earth metal ions, into their cavities via an ion-dipole interaction. The fascination for binding and significant interaction for particular cation with macrocyclic crown ether is most interesting challenge. It has been found that size factor of crown ether cavity and cations diameter largely favor the interaction and formation of complexes. In general, oxygen crown ethers are effective for the extraction of alkali and alkaline earth metal ions. The solvent extraction method is extensively used to evaluate the cation binding behavior of crown ethers. Present paper describes synthesis of benzocrown ether derivatives and their solvent extraction with organic salts of some alkaline earth metals.