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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Effect of an alkyl substituent and spacer length in benzene-centered tripodal diglycolamides on the sequestration of minor actinides
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Effect of an alkyl substituent and spacer length in benzene-centered tripodal diglycolamides on the sequestration of minor actinides

机译：烷基取代基和间隔长度在苯中心三码型北甲酰胺上对轻微辐射素螯合的影响

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摘要

Three benzene-centered tripodal diglycolamide (Bz-T-DGA) ligands, where diglycolamide (DGA) moieties are tethered to the central benzene ring through a methylene spacer and having either a hydrogen atom (L-I) or an isopentyl group (L-II) attached to the N-atom, and DGA moieties attached via an ethylene spacer and having an isopentyl group attached to the N-atom (L-III), were studied for their complexation and extraction abilities towards trivalent actinides and lanthanides. The distribution ratio of Am(III) and Eu(III) with 1 mmol L-1 ligand in 5% iso-decanol/n-dodecane followed the order: L-II L-III L-I. The substitution of the H atom with the isopentyl group on the N-atom of the DGA moieties resulted in two orders of magnitude enhancement in the extraction ability of the ligand. On the other hand, increase in the spacer length between the benzene ring and the DGA moieties resulted in several fold reduction in the extraction ability of the ligand. Spectroscopic studies with Eu3+ ions in acetonitrile also confirmed the metal/ligand complex formation constant in the order: L-II L-III L-I. Luminescence decay lifetimes of Eu3+/ligand complexes confirmed the absence of water molecules and that all the primary coordination sites of the metal ion are occupied by the ligands.
机译：以三个苯中心的三码型北甲酰胺（BZ-T-DGA）配体，其中达克洛胺（DGA）部分通过亚甲基垫片拴在中央苯环上并具有氢原子（Li）或异戊基（L-II）研究了通过乙烯间隔物连接并具有连接到N-原子（L-III）的异戊基（L-III）附着的DGA部分，用于它们络合和提取能力，朝向三价散曲线和镧系元素。 AM（III）和EU（III）的分布比用1mmol L-1配体在5％ISO-癸醇/ N-十二烷下进行序列：L-II＆GT; L-III＆GT;我。将H原子与异戊基在DGA部分的N-原子上取代导致配体提取能力中的两个数量级增强。另一方面，苯环和DGA部分之间的间隔物长度增加导致配体的提取能力降低了几倍。用EU3 +离子在乙腈中的光谱研究还证实了金属/配体复合物形成的顺序：L-II＆GT; L-III＆GT;我。 Eu3 + /配体复合物的发光衰减寿命证实不存在水分子，并且金属离子的所有初级配位位点被配体占据。

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