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Carbon ring

20.08.2019

Chemists from the University of Oxford and the IBM Research Center have reported the first successful synthesis of a molecule containing eighteen carbon atoms arranged in a ring. And yes, there is no mistake here, they received exactly the molecule - in a single copy. However, this synthesis was very different from the usual chemical experiments. First, the researchers took a molecule that already contained the prototype of the future carbon ring, but it was stabilized by a kind of "paper clips" that did not allow it to fall apart.

The resulting workpiece was then placed on a specially prepared substrate. After that, at low temperature and low pressure, using an atomic force microscope, those very paper clips were sequentially separated from this molecule, leaving one carbon ring consisting of eighteen atoms. What is most surprising, the molecule did not fall apart and remained "lying" on the substrate intact.

Most of all, researchers were interested in the question of how the bonds between carbon atoms in the ring are arranged. Let's imagine that carbon has four "arms" - they will symbolize four chemical bonds. When such four-armed atoms are in a ring, they have two options for holding on to each other. The first option is when each atom holds a neighbor to the left and right with both hands. In this case, all bonds in the ring will be the same in length and strength. Alternatively, the carbon atom can hold the neighbor on the left with one hand, and the neighbor on the right with all the remaining three hands. Then single bonds and triple bonds will alternate in the ring. It is precisely the second option that was confirmed in practice for a carbon ring of eighteen atoms.

What could be useful in this unusual substance, if only to obtain one molecule of it, you need to spend such a huge effort? The researchers suggest that such systems may have the properties of semiconductors, and it is quite possible that they will find their application in the future. In addition, this work opens up a whole new direction in the synthesis of carbon compounds.

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