期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 22, 页码 5093-5099出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202000525
关键词
macrocycles; molecular knots; rhodium; self-assembly; supramolecular chemistry
资金
- National Science Foundation of China [21531002, 21720102004]
- Shanghai Science and Technology Committee [19DZ2270100]
- Alexander von Humboldt Foundation
Understanding and controlling the topology of self-assembled structures plays a fundamental role in supramolecular chemistry. Herein, the preparation of a series of tetranuclear metallarectangles and hexanuclear trefoil knots featuring Cp*Rh building blocks by template-free self-assembly with four different rigid and flexible ligands is described. Transformations between the trefoil knots and the corresponding macrocycles can be induced by using concentration effects. Remarkably, the hexanuclear trefoil knot 5 was shown to assemble further to provide rare examples of [12+1] heteronuclear double trefoil knots (5 a/5 b/5 c/5 d) through coordination of the amide oxygen atoms to the secondary metal ions Na+/K+/Ca2+/Cd2+. The synthetic results are supported by single-crystal XRD.
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