Aggregation of Rare Earth Coordination Complexes in Solution Studied by Paramagnetic and DOSY NMR.

Aggregation of Rare Earth Coordination Complexes in Solution Studied by Paramagnetic and DOSY NMR.
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通过顺磁和 DOSY NMR 研究溶液中稀土配位配合物的聚集。

DOI:
10.1002/chem.201803766
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发表时间:
2018
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Poh AWJ
Poh AWJ
中科院分区:
--
文献类型:
--
作者:
Poh AWJ

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中性9配位稀土配合物的聚集程度已被证明会影响其配体场,如Y(III)配合物的扩散有序NMR光谱(DOSY-NMR)测量、Yb和Tb类似物的顺磁NMR分析以及EuIII系统的发射光谱研究所揭示的。在非极性介质中,亲脂性三异丙基络合物[Ln.L2]倾向于在氯仿和二氯甲烷中聚集,产生低聚物,而在乙酸和三氟乙酸中,极性更强的母体络合物[Ln.L1]也聚集,深刻影响假接触位移和Eu发射光谱的形式。这种行为在响应光谱探针的设计中具有重要意义。
The degree of aggregation of neutral, 9‐coordinate rare earth coordination complexes has been shown to affect their ligand field, as revealed by diffusion‐ordered NMR spectroscopy (DOSY‐NMR) measurements on Y(III) complexes, paramagnetic NMR analyses of Yb and Tb analogues and emission spectral studies with the EuIIIsystems. In non‐polar media a lipophilic tris‐isopropyl complex, [Ln.L2] tends to aggregate in chloroform and dichloromethane giving rise to oligomers, whereas in acetic and trifluoroacetic acid the more polar parent complex, [Ln.L1], also aggregates, profoundly affecting the pseudocontact shift and the form of the Eu emission spectrum. Such behaviour has important implications in the design of responsive spectral probes.
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