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首页> 外文期刊>Chemistry: A European journal >Adjustment of Twist Angles in Pseudo-Helical Lanthanide Complexes by the Size of Metal Ions
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Adjustment of Twist Angles in Pseudo-Helical Lanthanide Complexes by the Size of Metal Ions

机译：伪螺旋镧系配合物的扭曲角通过金属离子尺寸的调节

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摘要

Control of self-assembled nanostructures is a promising technique for nanotechnology. We have examined as to whether nanostructures could be controlled by the size of the central metal ion. Lanthanides are a natural choice for such a study as the size of their trivalent ions changes with atomic number gradually. For this investigation, a series of rare earth complexes ([LaL~1], [CeL~1], [SmL~1], [TbL~1], [YL~1], and [LuL~1]) with a tripodal heptadentate ligand L~1 were synthesized, and their X-ray crystallographic analysis was performed. Although the structures of the ligand (H_3L~1) and of the metal complex ([ML~1]) were quite different, all complexes were almost isostructural pseudohelices. The result of the crystallographic studies demonstrated that the twist angles of helices in the complexes depend on the ionic size of the central metal. A detailed analysis helped determine which portion of the helical strand contributed to the total helicity, and the major cause for the difference in helicity among the lanthanides is discussed. Moreover, this result is the first example showing that La~(III) and Lu~(III) complexes with the same tripodal heptadentate ligand are isostractural.
机译：自组装纳米结构的控制是纳米技术的有希望的技术。我们已经检查了纳米结构是否可以由中心金属离子的大小控制。镧系元素是此类研究的自然选择，因为其三价离子的大小会随着原子序数的变化而逐渐变化。对于本研究，一系列稀土配合物（[LaL〜1]，[CeL〜1]，[SmL〜1]，[TbL〜1]，[YL〜1]和[LuL〜1]）与合成了三脚架七齿配体L〜1，并进行了X射线晶体学分析。尽管配体（H_3L〜1）和金属配合物（[ML〜1]）的结构有很大不同，但所有配合物几乎都是同构假螺旋。晶体学研究的结果表明，配合物中螺旋的扭转角取决于中心金属的离子尺寸。详细的分析有助于确定螺旋链的哪一部分有助于总螺旋度，并讨论了镧系元素之间螺旋度差异的主要原因。此外，该结果是第一个实例，表明具有相同三脚架七齿配体的La〜（III）和Lu〜（III）配合物是同构的。

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