镧系元素
化学
滴定法
菲咯啉
配体(生物化学)
萃取(化学)
无机化学
配合物的稳定常数
羧酸盐
化学计量学
物理化学
立体化学
有机化学
水溶液
离子
受体
生物化学
作者
Sheng Wang,Xiaofan Yang,Lei Xu,Chengliang Xiao
标识
DOI:10.1021/acs.iecr.4c01205
摘要
The separation of lanthanides (Ln(III)) is a challenging task because of their similar physiochemical properties. In this work, the extraction and complexation behavior of Ln(III) with a saponified phenanthroline carboxamide ligand 9-(N,N-dioctylcarbamoyl)-1,10-phenanthroline-2-sodium carboxylate (NaDOAPA) was investigated. The saponified ligand NaDOAPA showed a considerable ability to separate heavy lanthanides from light and middle lanthanides in acidic solutions (2 ≤ pH ≤ 5), with an average separation factor of 2.5 for the adjacent heavy lanthanides. The complexation mechanism between Ln(III) and NaDOAPA was thoroughly investigated by 1H NMR titration, ultraviolet–visible (UV–vis) spectrophotometric titration, and fluorescence spectrophotometric titration. The coordination chemistry studies indicated that NaDOAPA could complex with Ln(III) with 1:1 and 1:2 stoichiometries. The increasing stability constants (log β) further suggested a stronger affinity of the ligand for heavy lanthanides, consistent with solvent extraction results. The Ln(III) complexes with different stoichiometries were characterized by crystallography to give a molecular-level explanation of the extraction and complexation mechanism. This work provides a promising choice for the separation of heavy lanthanides. The thorough study of the extraction and complexation of lanthanides will also facilitate the application of the ligand in practical processes.
科研通智能强力驱动
Strongly Powered by AbleSci AI