Abstract

N-Hydroxy- N-naphthylbenzamides ( 3) were synthesized for examining their ability to extract and transport Cu(II) through a liquid membrane. The transport was proton-driven and was capable of moving metal ions `up-hill'. Thus, it was possible to follow the transfer of Cu(II) from the aqueous source phase to the organic layer and from the organic layer to the receiving phase. The N-hydroxy- N-(2-naphthyl)benzamide ( 3b) carrier displayed much more remarkable selectivity for Cu(II) compared with N-hydroxy- N-(1-naphthyl)benzamide ( 3a). This difference in selectivity was explained in terms of the stability of the Cu(II) complex in chloroform.

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