Abstract
The synergistic extraction of europium(III) with thenoyltrifluoroacetone (HTTA) and some neutral oxo-donors, viz. diphenyl sulphonide (DPSO), tributylphosphate (TBP) and trioctylphosphine oxide (TOPO) has been studied in benzene. Results indicate that two synergistic species having one and two oxo-donor molecules are simultaneously extracted. The thermodynamic parameters associated with the formation of these two synergistic adducts have been evaluated by the temperature coefficient method which indicate that the reactions are predominantly enthalpy stabilised. Difference in the thermodynamic behaviour of Eu(TTA) 3·2TOPO from that of similar adducts with TBP and DPSO has been attributed to possible steric hindrance effects of TOPO.
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