Synthesis and metal ion extraction of cone di-ionizable calix[4]arene-crown-7 ligands
Tóm tắt
Cone calix[4]arene-1,3-crown-7 ligands bearing acidity tunable di-ionizable groups were prepared to examine the effect of the cavity size for the crown ether ring. The results of solvent extraction from aqueous solutions into chloroform show that these ligands are highly selective for Ba2+ among the alkaline earth metal cations and are good extractants for Pb2+ and for Hg2+.
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