β-ジケトンとビピリジルによるユウロピウム(III) の協同抽出の大きさに及ぼすビピリジルの異性体効果

概要

論文の詳細を見る
Europium(III) was extracted into chloroform with pivaloyltrifluoroacetone (1,1,1-trifluoro-5,5-dimethyl-2,4 hexanedion, PTA) and 2,2'-bipyridyl (2,2'-bpy) or with PTA and 4,4'-bipyridyl (4,4'-bpy). By combining the extractants, the extraction was improved, although the enhancement with PTA and 2,2'-bpy was much larger than that with PTA and 4,4'-bpy (the distribution ratio in the presence of 10^-2 M 2,2'-bpy was enhanced by a factor of almost 10^4, while that in the presence of 10^-2 M 4,4'-bpy was as high as 10 times, compared to the distribution ratio in the extraction with PTA, itself, reflecting the function of the bidentate (2,2'-bpy) and the monodentate (4,4'-bpy). In addition, the extracted species with PTA and 4,4'-bpy were accompanied by four PTA and one 4,4'-bpy, EuA_3・HA・B as well as EuA_3, EuA_3・B and EuA_3・2B. As the extracted species of lanthanoids(III) with β-diketone and a monodentate Lewis base, such as tributylphosphate, EuA_3, EuA_3・B and EuA_3・2B were reported before. The extraction as EuA_3・HA・B may reflect that the Lewis basicity of 4,4'-bpy is similar to that of PTA.
2002-09-05