Azocalixarene. 5: p-Substituted Azocalix4arenes as Extractants for Dichromate Anions
In this article, chromium(VI) extraction properties of two azocalix4arene based receptors (L4 and L6) are reported. A preliminary evaluation of the binding efficiencies of p-substituted azocalix4arene derivatives L4 and L6 was carried out by solvent extraction of Na-dichromate from aqueous solution into dichloromethane at different pH. It was observed that the new compounds are effective extractants for transferring the HCr2O7-/Cr2O72- anions at low pH. The binding ability of these compounds toward HCr2O7-/Cr2O72- anions depends upon Na+ extraction.
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