本文结合四种锂的离子对萃取体系,从锂络合物结构探讨了与Li~+对应阴离子结构对同位素分离效应的影响。其中螯合型接触离子对体系和环醚隔离离子对体系呈现明显的阴离子结构效应。前者随着整合阴离子对Li~+螯合键的增强,有机相富集?~7Li效应增大;后者随着阴离子电荷密度减少和软度增大,不仅有利于萃取分配,而且有利于~6Li的富集。 In this paper, four kinds of ion-pair extraction system of lithium were used to investigate the effect of the anion structure corresponding to Li ~ + on the separation of isotopes from the structure of lithium complexes. Among them, the chelating contact ion pair system and the cyclic ether ion pair exhibited obvious anion structure effect on the system. The former with the anions on the Li ~ + chelate bond enhancement, organic enrichment ~ 7Li effect increases; the latter with the anionic charge density and softness increases, not only conducive to the extraction and distribution, and is conducive to ~ 6Li enrichment.