Abstract
The extraction of anionic metal complexes was investigated by use of diphosphonium-type liquid anion-exchange extractants, which bear two cationic centers at various distances within a molecule (R3P+-(CH2)n-P+R3: R=octyl, n=2-10; abbreviated as CnBP). When MIIX42- type anionic complexes of divalent metal ions (zinc(II), cadmium(II), and palladium(II)) were extracted, the metal extractability decreased in the order: C10-≈C6-C4-C3- C2BP monocationic extractants (R3R′P+, abbreviated as MP). However, in the extraction of MIIIX4- type complexes of trivalent metal ions (iron(III) and indium(III)), the extractability order was different: MP≈C10-≈C6-C4- C3-C2BP. The unique metal extraction selectivity of the dicationic extractants is discussed in terms of charge interactions within the extracted ion-pair complexes.
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