AI Article Synopsis
- - The molecular figure-eight knot (notation: 4) is a rare and complex structure, posing significant challenges for synthesis due to its complicated entanglement.
- - Researchers developed a quadruple stacking strategy that successfully facilitates the self-assembly of these knots using naphthalenediimide-based ligands and Cp*Rh building blocks in a straightforward process.
- - Adjusting the size of the Cp*Rh units influences the stability of the knots in methanol, and the structure can reversibly transform between figure-eight knots and metallorectangles depending on conditions such as concentration and solvent.
Article Abstract
Molecular figure-eight knot (notation: 4) is extremely rare and presents great synthetic challenge due to its essentially complicated entanglement. To solve this synthetic problem, a quadruple stacking strategy was developed. Herein, we report the efficient self-assembly of figure-eight knots induced by quadruple stacking interactions, through the combination of four carefully selected naphthalenediimide (NDI)-based pyridyl ligands and Cp*Rh building blocks bearing large conjugated planes in a single-step strategy. Notably, slight size adjustment of the Cp*Rh units was found to affect the stability of the figure-eight knots in methanol. Additionally, reversible structural transformations between these figure-eight knots and corresponding metallorectangles could be achieved by concentration changes and solvent- and guest-induced effects. X-ray crystallographic data and NMR spectroscopy provide full confirmation of these phenomena.
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| http://dx.doi.org/10.1021/jacs.0c09162 | DOI Listing |
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