The effects of choice of anion (X=Cl-, SCN-, NO3-) and polyethylene glycol (PEG) chain length on the local and supramolecular structures of LnX(3)/PEG complexes
The effects of choice of anion (X=Cl-, SCN-, NO3-) and polyethylene glycol (PEG) chain length on the local and supramolecular structures of LnX(3)/PEG complexes
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DOI：
10.1016/s0925-8388(96)02640-0
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发表时间：
1997-03-15
影响因子：
6.2
通讯作者：
Bauer, CB
中科院分区：
文献类型：
--
作者：
Rogers, RD;Zhang, JH;Bauer, CB
我们用结构表征了许多三乙烯与庚二醇合成的LnCl(3)、Ln(SCN)(3)和Ln(NO3)(3)的配合物。链长通常控制主配位球和存在的附加内球配体(阴离子、水或溶剂分子)的数量。在所研究的三种阴离子中，硝酸根阴离子由于其对双齿配位的偏好和它的硬氧供体，对聚乙二醇构象的影响最大。这些络合物的第三个通常被忽视的方面是由聚乙二醇醇末端和水分子的氢键产生的超分子结构的性质。在这篇演讲中，我们回顾了几个不同的结构系列，并讨论了从观察到的内球和外球配位随阴离子类型、聚乙二醇链长度和金属离子半径的微小差异而明显的微妙趋势。
We have structurally characterized many LnCl(3), Ln(SCN)(3) and Ln(NO3)(3) complexes of triethylene through heptaethylene glycols. The chain length typically controls the primary coordination sphere and the number of additional inner-sphere ligands (anions, water or solvent molecules) present. Of the three anions studied, the nitrate anion, with its preference for bidentate coordination and its hard oxygen donors, has the greatest effect on the PEG conformations. A third aspect of these complexes which has typically been overlooked is the nature of the supramolecular structures generated by hydrogen bonding of the PEG alcoholic termini and water molecules. In this presentation we review the several different structural series and discuss subtle trends that are apparent from small differences in the observed inner and outer-sphere coordination as a function of anion type, PEG chain length, and metal ionic radius.