Journal
NATIONAL SCIENCE REVIEW
Volume 7, Issue 10, Pages 1548-1556Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwaa164
Keywords
coordination-driven self-assembly; supramolecular chemistry; interlocked structure; metalla[3]catenanes; molecular Borromean rings; ring-in-ring complex
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Funding
- National Natural Science Foundation of China [21531002, 21720102004, 21801045]
- Shanghai Science and Technology Committee [19DZ2270100]
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Despite extensive research and several stunning breakthroughs in the synthesis of interlocked molecular species, [3]catenanes, Borromean rings and ring-in-ring complexes are exceedingly rare and their targeted synthesis remains a formidable challenge. Herein, a series of Cp*Rh-based homogeneous and heterogeneous interlocked structures have been prepared by coordination-driven self-assembly, not only including metalla[2]catenanes and molecular Borromean rings, but also linear metalla[3]catenanes and ring-in-ring complexes. The interlocked structures are all based on bithiophenyl groups. The bithiophenyl groups effectively enhance the strength of the inter-ring interactions and play a crucial role in the formation of these interlocked structures. By taking advantage of the strong interaction between pi-donor (D) and pi-acceptor (A) groups, the electron-deficient methylviologen cation was introduced into a cationic metallarectangle based on bithiophenyl groups. Taking inspiration from these results, a cationic metallarectangle based on A units was threaded into a metallarectangle based on D units, leading to a heterogeneous D-A ring-in-ring structure.
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