Abstract
ABSTRACT The equilibrium extraction behavior of a series of tervalent lanthanides (La, Pr, Eu, Ho, and Yb) with 2-methyl-8-quinolinol(HL) in chloroform has been studied. Although the sterically hindered extractant does not form neutral LnL3, complexes, ion pair complexes of intermediate chelates with either perchlorate or thio-cyanate ions are extractable. The extraction constants of such species are smaller than those of other 8-quinolinols and closer together because the adverse steric influence of the 2-methyl group is greater on the heavier lanthanide ions. The rates of extraction of the complexes were found to be unusually slow.
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