Studies of the Liquid-Liquid Partition Systems. IV. The Solvent Extraction Study of Europium(III) Adduct Chelate Complexes with Six Acetylacetone Derivatives and Tributylphosphate

Abstract

The extraction of europium(III) in 0.1 m sodium perchlorate with acetylacetone, benzoylacetone, trifluoroacetylacetone, benzoyltrifluoroacetone, froyltrifluoroacetone and thenoyltrifluoroacetone in chloroform and the adduct formation of these metal chelates with tributylphosphate have been studied at 25°C.It has been concluded that: (i) The β-diketones which have one trifluoromethyl group extract europium(III) better than those which have no trifluoromethyl group. The difference in the metal extraction with acetylacetone or trifluoroacetylacetone and the metal extraction with the homologues of these β-diketones seems to be mainly due to the aqueous chelate complex formation, (ii) A metal chelate with a β-diketone which has a trifluoromethyl group is a much better acceptor of tributylphosphate to form adduct complexes than a metal chelate with a β-diketone which has no trifluoromethyl group. (iii) The ability of the acetylacetone chelate or the trifluoroacetylacetone chelate to form an adduct is not very much changed by the replacement of the methyl group with a benzoyl, froyl, or thenoyl group.