Influence of a N-Heterocyclic Core on the Binding Capability of N,O-Hybrid Diamide Ligands toward Trivalent Lanthanides and Actinides
作者:Ruixue Meng、Lei Xu、Xiao Yang、Mingze Sun、Chao Xu、Nataliya E. Borisova、Xingwang Zhang、Lecheng Lei、Chengliang Xiao
DOI:10.1021/acs.inorgchem.1c00715
日期:2021.6.21
and Eu(III), were determined through spectrophotometric titration. It is found that Pyr-DAPhen formed the most stable complexes, while Pyr-PyDA formed the most unstable complexes with lanthanides, which coincided well with the following solvent extraction results. The solid-state structures of 1:1 type complexes of these three ligands with La(III), Nd(III), and Er(III) in nitrate media were identified
具有 N-杂环骨架的 N,O-杂化二酰胺配体是在高酸性 HNO 3溶液中选择性分离锕系元素而不是镧系元素的有前途的萃取剂之一。在这项工作中,三个硬-软供体混合二酰胺配体,吡啶-2,6-二基双(吡咯烷-1-基甲酮)(Pyr-PyDA),2,2'-联吡啶-6,6'-二基双(吡咯烷-1-基甲酮)(Pyr-BPyDA)和(1,10-菲咯啉-2,9-二基)双(吡咯烷-1-基甲酮)(Pyr-DAPhen)被合成并用于探测 N-杂环核与三价镧系元素和锕系元素的络合和萃取行为。1H NMR 滴定实验表明,三种配体与镧系元素之间主要形成 1:1 金属配体配合物,但三齿 Pyr-PyDA 与 Lu(III) 之间也形成 1:2 型配合物。这三种配体与两种典型的镧系元素 Nd(III) 和 Eu(III) 的稳定性常数 (log β) 通过分光光度法滴定确定。发现Pyr-DAPhen形成的配合物最稳定,而Pyr