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<p>The Borromean link, characterized by structural integrity and aesthetic beauty, represents one of the most intriguing entanglements. Most Borromean links consist of three identical macrocycles, and there are few examples of links constructed from trimeric cages. Here, by selecting a tetrapyridyl ligand derived from dibenzo-18-crown-6 and two binuclear building units, we construct two high-yield molecular-cage-based Borromean links comprised of over 1,100 non-hydrogen atoms, in particular, 24 rhodium(III)/iridium(III) and six sodium(I) ions. Facilitated by multiple aromatic stacking interactions between components, three identical coordination cages are found to be linked with a Borromean link topology. These structures are confirmed by X-ray crystallographic analysis, detailed nuclear magnetic resonance spectroscopy, electrospray ionization-time-of-flight/mass spectrometry and elemental analysis. The cage-based Borromean links constructed in this work using coordination cages rather than rectangles have enriched the kinds of Borromean links, and the bottom-up synthetic strategy has provided additional insights into the design and synthesis of more sophisticated architectures.</p><p></p>

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Synthesis of molecular Borromean links featuring trimeric metallocages

  • 期刊论文

  • 发表日期：

    2025年1月14日

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  • Hai-Ning Zhang,
  • Guo-Xin Jin

摘要

The Borromean link, characterized by structural integrity and aesthetic beauty, represents one of the most intriguing entanglements. Most Borromean links consist of three identical macrocycles, and there are few examples of links constructed from trimeric cages. Here, by selecting a tetrapyridyl ligand derived from dibenzo-18-crown-6 and two binuclear building units, we construct two high-yield molecular-cage-based Borromean links comprised of over 1,100 non-hydrogen atoms, in particular, 24 rhodium(III)/iridium(III) and six sodium(I) ions. Facilitated by multiple aromatic stacking interactions between components, three identical coordination cages are found to be linked with a Borromean link topology. These structures are confirmed by X-ray crystallographic analysis, detailed nuclear magnetic resonance spectroscopy, electrospray ionization-time-of-flight/mass spectrometry and elemental analysis. The cage-based Borromean links constructed in this work using coordination cages rather than rectangles have enriched the kinds of Borromean links, and the bottom-up synthetic strategy has provided additional insights into the design and synthesis of more sophisticated architectures.