Atanassova Maria, Kaloyanova Stefka, Deligeorgiev Todor
Acta Chim Slov. 2010 Dec;57(4):821-7.
The 4,4,4-trifluoro-1-(biphenyl-4-yl)butane-1,3-dione(HL) has been synthesized and its complexation properties in solution was examined. Mixed ligand chelate extraction of light trivalent lanthanoids (La÷Gd) from chloride medium at constant ionic strength µ = 0.1 into C6H6 with HL in combination with one of the three phosphine oxide compounds trioctylphosphine oxide(TOPO), tributylphosphine oxide(TBPO) or triphenyphosphine oxide(TPPO) was studied. The composition of the extracted species was established as LnL3 with HL alone and as LnL3 2S in the presence of TOPO and TBPO or LnL3 S with the mixture of HL-TPPO. The 28 values of the overall equilibrium constants were calculated. A synergic effect up to 103-104 was observed for the extraction of the above-mentioned lanthanoid ions with binary mixtures of extractants. The change of the synergistic agent causes a significant increase of the KL,S values in the order TBPO < TPPO < TOPO. The parameters of the extraction process were determined and the separation factors between two adjacent Ln(III) were calculated.
已合成了4,4,4-三氟-1-(联苯-4-基)丁烷-1,3-二酮(HL)，并研究了其在溶液中的络合性质。研究了在恒定离子强度μ = 0.1的氯化物介质中，用HL与三种氧化膦化合物之一三辛基氧化膦(TOPO)、三丁基氧化膦(TBPO)或三苯基氧化膦(TPPO)组合，从氯化物介质中混合配体螯合萃取轻三价镧系元素(La÷Gd)到苯中的情况。确定了萃取物种的组成，单独使用HL时为LnL3，在TOPO和TBPO存在下为LnL3·2S，或在HL-TPPO混合物存在下为LnL3·S。计算了28个总平衡常数的值。观察到用萃取剂二元混合物萃取上述镧系离子时协同效应高达10³ - 10⁴。协同剂的变化导致KL,S值按TBPO < TPPO < TOPO的顺序显著增加。确定了萃取过程的参数，并计算了相邻两种Ln(III)之间的分离因子。
