An 18-Porphyrin Nanoring at the Size Limit for Global Aromaticity

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Conflicts of Interest

Identified Weaknesses

Rating Explanation

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Paper Summary

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Giant Molecular Ring Gets Zapped, Barely Becomes a Magnet

Researchers synthesized an 18-porphyrin nanoring, the largest molecule to date exhibiting evidence of global aromaticity. Using NMR and computational modelling, they found weak ring currents, which suggest that this size is close to the limit for this phenomenon. These findings highlight the role of size and conformation in molecular magnetism.

Possible Conflicts of Interest

None identified.

Identified Weaknesses

Computational limitations

The study relies heavily on computational methods, which, despite efforts to correct for limitations, still have inherent uncertainties and may not perfectly reflect real-world behavior. The agreement between experimental and computational results is only qualitative.

Weak ring current effects

The observed ring current effect is very weak compared to smaller aromatic rings. The majority of nanorings do not adopt the correct conformation to sustain a global ring current.

Limited generalizability

The study is limited to a specific type of porphyrin nanoring. It is unclear if the observations are generalizable to other macrocyclic systems.

Rating Explanation

This study investigates an important question regarding the size limits of global aromaticity. The synthesis and characterization of a very large nanoring are significant achievements. The combination of experimental and computational approaches provides valuable insights. While the observed effect is weak and limited by conformational flexibility, the overall research is strong and contributes to our understanding of aromaticity at the nanoscale.

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