Selective synthesis and structural transformation between a molecular ring-in-ring architecture and an abnormal trefoil knot,Chemical Science

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Selective synthesis and structural transformation between a molecular ring-in-ring architecture and an abnormal trefoil knot
Chemical Science ( IF 7.6 ) Pub Date : 2020-07-15 , DOI: 10.1039/d0sc02733b
Li-Long Dang ₁ , Xiang Gao ₁ , Yue-Jian Lin ₁ , Guo-Xin Jin _{1,

2}

Affiliation

The synthesis of complicated supramolecular architectures and the study of their reversible structural transformations remains a fascinating challenge in the field of supramolecular chemistry. Herein, two types of novel coordination compounds, a non-intertwined ring-in-ring assembly and an abnormal trefoil knot were constructed from a strategically selected Cp*Rh building block and a semi-rigid N,N′-bis(4-pyridylmethyl)diphthalic diimide ligand via coordination-driven self-assembly. Remarkably, the reversible transformation between the abnormal trefoil knot and the ring-in-ring assembly or the corresponding tetranuclear macrocycle could be achieved by the synergistic effects of Ag⁺ ion coordination and alteration of the solvent. Single-crystal X-ray crystallographic data and NMR spectroscopic experiments support the structural assignments.

中文翻译：

分子环中环结构与异常三叶结的选择性合成和结构转化

复杂超分子结构的合成及其可逆结构转变的研究仍然是超分子化学领域的一个令人着迷的挑战。在此，由策略性选择的 Cp*Rh 结构单元和半刚性 N , N '-双(4-吡啶基甲基)构建了两种类型的新型配位化合物，即非交织的环中环组装体和异常三叶结。）二邻苯二甲酰亚胺配体通过配位驱动的自组装。值得注意的是，异常三叶结与环中环组装体或相应的四核大环之间的可逆转化可以通过Ag ⁺离子配位和溶剂改变的协同作用来实现。单晶 X 射线晶体学数据和 NMR 光谱实验支持结构分配。

更新日期：2020-08-05

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