作者:Henk H. Dam、David N. Reinhoudt、Willem Verboom
DOI:10.1039/b704667g
日期:——
Multicoordinate ligands based on the trityl, C-pivot, and CTV platforms and the ligating groups CMPO, DGA, PICO, and MPMA were synthesized and studied for their extraction properties. The extraction efficiencies of these multicoordinate ligands are largely influenced by the properties of the platform. The DAm values follow the order CTV6 > trityl ≈ C-pivot > CTV3 > CTV0 with a maximum for CTV6CMPO of DAm = 30 (SAm/Eu = 1.4, cL = 10–4 M, 3 M HNO3). There is a strong relationship between the DAm values, increasing in the order of CTV0CMPO < CTV3CMPO < CTV6CMPO, and the ‘mobility’ of their CMPO groups. The SAm/Eu values are less influenced by the platform and range between 0.2 and 2.0, though they can reverse under the influence of the HNO3 concentration (CTV6PICOSAm/Eu = 0.7 at 0.001 M HNO3 to 1.2 at 0.01 M HNO3) or by changing the platform (CTV(0, 3 or 6)MPMA from SAm/Eu = 0.4 to 1.6 for tritMPMA both at 0.001 M HNO3). For the CMPO derivatives the SAm/Eu values are most consistent, ranging from 1.4 to 1.8.
研究人员合成了基于三苯甲基、C-枢轴和 CTV 平台以及连接基团 CMPO、DGA、PICO 和 MPMA 的多配位体,并对其萃取特性进行了研究。这些多配位体的萃取效率在很大程度上受平台性质的影响。DAm 值的顺序为 CTV6 > 三烷基 ≈ C-pivot > CTV3 > CTV0,其中 CTV6CMPO 的最大 DAm = 30(SAm/Eu = 1.4,cL = 10-4 M,3 M HNO3)。DAm 值按照 CTV0CMPO < CTV3CMPO < CTV6CMPO 的顺序递增,这与其 CMPO 基团的 "流动性 "之间有着密切的关系。SAm/Eu 值受平台的影响较小,介于 0.2 和 2.0 之间,但在 HNO3 浓度的影响下(CTV6PICOSAm/Eu = 0.7(0.001 M HNO3 时)至 1.2(0.01 M HNO3 时))或改变平台(CTV(0、3 或 6)MPMA 的 SAm/Eu = 0.4 至 1.6(tritMPMA,均为 0.001 M HNO3 时)),SAm/Eu 值会发生逆转。CMPO 衍生物的 SAm/Eu 值最为一致,从 1.4 到 1.8 不等。