According to the physicist organization network recently, researchers at Northwestern University in the United States have developed a way to make new types of free radical compounds: for the first time, they will permanently repel two identical cation rings that would normally repel each other. Connected, and this is what many scientists call an impossible task.
On the surface, these rings should "hate" each other because they each carry 4 positive charges. But through the introduction of free radicals, that is, the formation of atoms or groups with unpaired electrons in the covalent bond of the compound molecules under the external conditions such as light and heat, scientists can create a "love-hate interweaving" relationship, and eventually The result is the "love" interconnection of cationic rings.
Unpaired electrons need to be paired to assume a stable state, and the researchers also proved that the single electron of one ring is more attractive to the single electron of the other ring than the repulsive force between them. This process can use mechanical bonding instead of chemical bonding to connect the cationic ring, so it can be put in place at one time and is not easy to be torn apart. Research reports on these new types of stable organic free radicals have been published in the journal Science on January 25.
Fraser Studart, a professor at the school ’s chemistry department, said: “People do n’t end up in a failed connection attempt between two rings, but they never think that it is possible. But now, we have done it.†In fact Stuttgart was one of the early pioneers who introduced mechanical bonding to compounds in the 1980s.
As the first author of the paper, the first strategy tried by Jonathan Barnes was to temporarily add electrons to reduce the charge and connect the two rings, and it worked on the first attempt. When the compound is oxidized and loses electrons, a strong positive force will make a comeback. Although "hate" has always been there, it has been difficult to separate the two rings.
It is true that most organic free radicals can only survive for a short time, but this new type of free radical compound can exist stably in air and water. Compounds hide electrons in the structure, so they cannot react with the outside environment. Mechanical bonding is also very resistant, despite the adverse electrostatic reactions.
Scientists say that the new compound not only has compelling electronic properties, but also enables fast, low-cost manufacturing. The two interlocking rings can also contain a huge amount of charge in a space of a few nanometers, or can expand into a long chain polymer. The compound can choose one of the six oxidation states, accepting up to 8 electrons in total. Therefore, this will also contribute to technological improvements in battery, semiconductor and electronic storage device manufacturing.
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