Self-Assembly, Structural Transformation and Guest-Binding Properties of Supramolecular Assemblies with Triangular Metal-Metal Bonded Units,Journal of the American Chemical Society

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Self-Assembly, Structural Transformation and Guest-Binding Properties of Supramolecular Assemblies with Triangular Metal-Metal Bonded Units
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-01-15 , DOI: 10.1021/jacs.9b12309
Li-Juan Wang ₁ , Xin Li ₁ , Sha Bai ₁ , Yao-Yu Wang ₁ , Ying-Feng Han ₁

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The properties of supramolecular structures are highly dependent on their metal-centered building blocks and organic linkers, thus the search for novel systems will lead to new functions and applications for these unique assemblies. Here, two discrete triangular trimetallic sandwich building blocks were developed to construct supramolecular assemblies through coordination-driven self-assembly with organosulfur ligands. A series of tube-like (Tr2Pd3)4L6 assemblies (Tr = cycloheptatrienyl ring) were obtained from a discrete triangular tripalladium sandwich complex with bifunctional organosulfur ligands. By replacing the metal centers of the platinum analogue, the self-assembly process resulted in the clean formation of (Tr2Pt3) 2L3 triple helicates instead of tube-like species. The trimetallic sandwich building blocks were shown also to form face-capped (Tr2M3)4L4 (M = Pd or Pt) tetrahedral cages when trifunctional organosulfur ligands were used. The supramolecular assemblies were comprehensively analyzed by X-ray crystallography. A metal-cluster-induced structural transformation between (Tr2Pd3)4L4 tubes and (Tr2Pt3)2L3 triple helicates was observed. Furthermore, the face-capped (Tr2Pd3)4L4 cage possesses a tetrahedral cavity allowing encapsulation of a series of guests.

中文翻译：

具有三角形金属-金属键合单元的超分子组装体的自组装、结构转变和客体结合特性

超分子结构的特性高度依赖于它们以金属为中心的构建块和有机连接体，因此寻找新系统将为这些独特的组件带来新的功能和应用。在这里，开发了两个离散的三角形三金属夹层积木，通过与有机硫配体的配位驱动自组装来构建超分子组装。一系列管状 (Tr2Pd3)4L6 组件（Tr = 环庚三烯基环）是从具有双功能有机硫配体的离散三角形三钯夹心复合物获得的。通过替换铂类似物的金属中心，自组装过程导致 (Tr2Pt3) 2L3 三重螺旋的清洁形成，而不是管状物质。当使用三功能有机硫配体时，三金属夹心结构单元也显示出形成面盖 (Tr2M3)4L4 (M = Pd 或 Pt) 四面体笼。通过 X 射线晶体学对超分子组件进行了综合分析。观察到 (Tr2Pd3)4L4 管和 (Tr2Pt3)2L3 三重螺旋之间的金属簇诱导结构转变。此外，面罩 (Tr2Pd3)4L4 笼具有四面体腔，可以封装一系列客人。

更新日期：2020-01-15

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