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A Chiral Cyclometalated Iridium Star of David [2]Catenane
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-01-05 , DOI: 10.1021/jacs.0c12038
David P. August 1 , Javier Jaramillo-Garcia 1 , David A. Leigh 1 , Alberto Valero 1 , Iñigo J. Vitorica-Yrezabal 1
Affiliation  

Although circular helicates can be assembled with a range of labile transition-metal centers, solely "chiral-at-metal" examples (i.e., systems without chiral ligands) and heterometallic (i.e., mixed metal systems, racemic or chiral) circular helicates both remain unexplored. Here, we report on the enantioselective synthesis of a heterometallic (Ir2Zn4) hexameric circular helicate and its elaboration into the corresponding triply interlocked Star of David [2]catenane. The relative inertness of Ir(III) enables enantiospecific synthesis of the hexameric circular helicate using chiral-at-metal building blocks. The resulting Star of David [2]catenane, which is a chiral 6-2-1 link, is formed as a single topological enantiomer. The X-ray crystal structure of the (Ir2Zn4)-catenane shows each of the two 95-atom-long macrocycles entwined around the six metal octahedral metal ions and each other, forming a triply interlocked circular double helix. Two PF6- anions reside above and below the central cavity. The Star of David [2]catenane, both with and without coordinated Zn(II) ions, retains the photophysical properties characteristic of cyclometalated Ir(III) complexes. The synthetic strategy opens up new research directions and opportunities for the assembly of other chiral knots, links, and heterometallic circular helicates.

中文翻译:

手性环金属化铱大卫之星 [2] 链烷烃

虽然圆形螺旋可以与一系列不稳定的过渡金属中心组装,但只有“金属手性”例子(即没有手性配体的系统)和异金属(即混合金属系统,外消旋或手性)圆形螺旋都保留未开发。在这里,我们报告了异金属 (Ir2Zn4) 六聚环状螺旋的对映选择性合成及其对相应的三重联锁大卫之星 [2] 链的详细说明。Ir(III) 的相对惰性使得能够使用金属手性构件对六聚环状螺旋进行对映特异性合成。由此产生的大卫之星 [2] 链烯是一个手性 6-2-1 链接,形成为单一的拓扑对映异构体。(Ir2Zn4)-catenane 的 X 射线晶体结构显示,两个 95 原子长的大环中的每一个都缠绕在六个金属八面体金属离子周围,并相互缠绕,形成三重互锁的圆形双螺旋。两个 PF6- 阴离子位于中央空腔的上方和下方。带有和不带有配位 Zn(II) 离子的大卫之星 [2] 链环保留了环金属化 Ir(III) 配合物的光物理特性。该合成策略为其他手性结、链节和异金属圆形螺旋的组装开辟了新的研究方向和机会。保留了环金属化 Ir(III) 配合物的光物理特性。该合成策略为其他手性结、链节和异金属圆形螺旋的组装开辟了新的研究方向和机会。保留了环金属化 Ir(III) 配合物的光物理特性。该合成策略为其他手性结、链节和异金属圆形螺旋的组装开辟了新的研究方向和机会。
更新日期:2021-01-05
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