色层法检测王冠化合物对稀土元素的络合能力

本文应用反相纸色层法和静态吸附平衡法检测了王冠化合物与稀土离子之间的络合能力和水相阴离子类型对络合能力的影响。所用的王冠化合物有:B-15-C-5,DB-18-C-6,四氢呋喃丙酮四聚体,DB-18-C-6-甲醛缩聚物和B-15-C-5-甲醛缩聚物。得到如下主要结果:1.不同王冠化合物的络合能力顺序是;B-15-C-5>DB-18-C-6》四氢呋喃丙酮吗聚体,另B-15-C-5-甲醛缩聚物>DB-18-C-6-甲醛缩聚物。2.稀土离子络合能力的顺序是:Sm³⁺Er³⁺=La³⁺(反相纸色层法),Er³⁺>Eu³⁺>La³⁺(吸附平衡法)。3.与不同阴离子缔合的离子对的稳定性顺序是:苦味酸根>三氯代乙酸根>磺基水杨酸根》Cl^-、NO₃^-、ClO₄^-及SO₄⁼。

DETECTION OF COMPLEXATIOM BETWEEN CROWN ETHERS AND RARE EARTH IONS BY CHROMATOGRAPHIC METHOD

The complexation between crown ethers and rare earth ions was detected by paper-chromatographic method and stastic adsorption equilibrium. The effect of counter-anion has also been studied.The crbwn ethers used were: Benzo-15-C-5, Dibenzo-18-C-6, Cylic tetra-mer of tetrahydrofuran and acetone, Benzo-15-C-5-formaldehyde copolymer and Dibenzo-18-C-6-formaldehyde copolymer.The main experimental results obtained are as follows:1. The order of stabity of complexes of various crown ethers with rare earths is: Benzo-15-C-5>Dibenzo-18-C-6>>Cyclic tetramer of tetrahydrofuran and acetone, and Benzo-15-C-5-formaldehyde copolymer>Dibenzo-18-C-6-formaldehyde copolymer.2. The order of stability of complexes of rare earth ions is- Sm³⁺ > Er³⁺=La³⁺ (by paper chromatographic test), and Er³⁺>Eu³⁺>La³⁺ (by method of adsorption equilibrium).3. The order of stability of ion-pairing with counter anions is: picrate> trichloroacetate>sulphonsalysilate>>Cr, NO₃^-, ClO₄^- and SO₄⁼.