EXTRACTION OF MANGANESE(II) BY MIXTURES OF DIDODECYLNAPHTHALENESULFONIC ACID AND T-BUTYL-CYCLOHEXANO-15-CROWN-5 - SPECTRAL EVIDENCE FOR THE FORMATION OF A MANGANESE(II) - CROWN-ETHER COMPLEX

Addition of t-butylcyclohexano-15-crown-5 (tBC-15C5) induces a synergistic effect in the extraction of Mn2+ ion with didodecylnaphthalenesulfonic acid (HDDNS). This synergism is the result of the inner-sphere complexation of the crown ether to the manganese(II) ion. The formation of this complex, first suggested by distribution studies, has been confirmed by FTIR experiments. The C-O-C stretching bands for the crown ether ligand shift to lower frequency when Mn2+ ion is extracted into a CC14 solution of HDDNS and tBC15C5. A similar C-O-C stretching band is observed for the crystalline complex [Mn(15C5)(BU3CSO3)2] (where 15C5 = 15-crown-5 and Bu =. © 1990, Taylor & Francis Group, LLC. All rights reserved.