Selective synthesis and structural transformation between a molecular ring-in-ring architecture and an abnormal trefoil knot |
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| Authors: | Li-Long Dang Xiang Gao Yue-Jian Lin Guo-Xin Jin |
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| Institution: | Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200438 P. R. China ; State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032 P. R. China, |
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| Abstract: | 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.The chemical reactivity of Ag+ ions and solvent effects induce reversible structural transformations between an abnormal trefoil knot, a tetranuclear macrocycle and a ring-in-ring architecture. |
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