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A team led by chemist Ramesh Jasti built a carbon-rich molecule with three identical nanohoops attached to a central triptycene skeleton. In the crystal, the molecules pack into layers and form hexagonal channels about 11 Å wide. The structure could be relevant to porous-material research, but its potential is not the same as a demonstrated application.
What is the nanohoop molecular propeller?
It is a molecule whose overall architecture resembles a three-bladed propeller: three identical carbon nanohoops extend from a central triptycene core. The research was reported in 2017 by P. Li, L. N. Zakharov and R. Jasti in a paper identified by DOI 10.1002/anie.201700935. The University of Oregon’s chemistry department described it as work from the Jasti lab.
The propeller is a molecular structure, not a consumer device. Its significance lies in how its shape and symmetry relate to the way molecules arrange themselves in a crystal.
How was the molecule made and characterized?
Chemistry World’s account of the 2017 study says the team used palladium-catalysed coupling reactions, followed by reductive aromatisation. The resulting material was reported as yellow crystals.
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The molecule has trigonal C3h symmetry. Its proton nuclear magnetic resonance (1H NMR) spectrum had eight peaks, as reported in Chemistry World’s account. These details describe the molecule’s symmetry and characterization; they do not by themselves establish how it would perform in a practical material.
How does the propeller pack in a crystal?
In the crystal, the molecules form layers of cyclic trimers. Those layers stack to create hexagonal channels with a reported diameter of 11 Å, according to Chemistry World’s 2017 report.
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The arrangement is notable because it creates space between the molecules. The report says a calculation found that nearly half of the crystal volume was accessible. That is a calculated structural estimate, not a measurement showing that a particular guest molecule was absorbed or stored.
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Possibly, as a direction for materials research. The researchers explored whether the propeller structure could host other molecules, and the calculated accessible space gives a reason to investigate that potential. The available account does not establish successful guest uptake, a working device, commercial availability or an operational use.
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To evaluate a porous-material claim, the key distinction is whether a report describes a possible pore structure or demonstrates performance. For this propeller, the reported channel dimensions and calculated accessible volume support interest in its architecture; they are not evidence of a deployed or commercially useful porous material.
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