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The chemical consequences of the gradual decrease of the ionic radius along the Ln-series
Coordination Chemistry Reviews ( IF 20.6 ) Pub Date : 2019-12-23 , DOI: 10.1016/j.ccr.2019.213146
Joop A. Peters , Kristina Djanashvili , Carlos F.G.C. Geraldes , Carlos Platas-Iglesias

In the periodical system, the lanthanides (the 15 elements in the periodic table between barium and hafnium) are unique in the sense that their trivalent cations have their valence electrons hidden behind the 5s and 5p electrons. They show a gradual decrease in ionic radius with increasing atomic number (also known as the lanthanide contraction). The resulting steric effects determine to a large extent the geometries of complexes of these ions. Here, we discuss these effects, particularly upon the properties of the complexes in aqueous solution, for selected families of Ln3+-complexes of oxycarboxylate and aminocarboxylate ligands. The physical properties of the cations are very different, which is very useful for the elucidation of the configuration, conformation and the dynamics of the complexes by X-ray techniques, NMR spectroscopy, and optical techniques. Often the structural analysis is assisted by computational methods.



中文翻译:

沿Ln系列离子半径逐渐减小的化学后果

在周期系统中,镧系元素(钡和ha之间的周期表中的15个元素)在其三价阳离子的价电子隐藏在5s和5p电子之后的意义上是独特的。它们显示出随着原子序数的增加,离子半径逐渐减小(也称为镧系元素收缩)。产生的空间效应在很大程度上决定了这些离子的配合物的几何形状。在这里,我们讨论了对于Ln 3+选定族的这些影响,尤其是对水溶液中络合物的性质的影响。-氧羧酸盐和氨基羧酸盐配体的络合物。阳离子的物理性质非常不同,这对于通过X射线技术,NMR光谱学和光学技术阐明络合物的构型,构象和动力学非常有用。通常,结构分析是通过计算方法来辅助的。

更新日期:2019-12-23
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