Abstract
Abstract Extraction of the trivalent actinides Am, Cm and Cf and lanthanides Eu, Tb, Tm and Lu has been studied with 1-phenyl-3-methyl-4-trifluoroacetyl pyrazolone- 5(HPMTFP) in chloroform and benzene. The formation of a self-adduct species M(PMTFP)3·HPMTFP has been observed with Am, Cm and Eu but only the chelate species M(PMTFP)3 with Cf, Tb, Tm and Lu. The reasons for the formation of a self-adduct species with lighter actinides and lanthanides and not with the heavier ones of the pyrazolones have been discussed.
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