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Secondo l'Organizzazione mondiale della sanità si infetterà un europeo su due. L'Ecdc mette tutto il continente in rosso. Come sarà la quarta ondata di Covid-19? Morti e ricoverati gravi saliranno ancora o siamo verso il picco che ci porterà poi a un lento rientro verso la normalità? Basteranno i vaccini? Abbiamo fatto bene a riaprire la scuola in presenza? Facciamo l'analisi della nuova stagione della pandemia con Carlo la Vecchia, epidemiologo dell'Università degli Studi di Milano.
A group of researchers from Hokkaido University has provided the first experimental evidence of the existence of a new type of chemical bond: the single-electron covalent bond, theorized by Linus Pauling in 1931 but never verified until now. Using derivatives of hexaarylethane (HPE), the scientists were able to stabilize this unusual bond between two carbon atoms and study it with spectroscopic techniques and X-ray diffraction. This discovery opens new perspectives in understanding bond chemistry and could lead to the development of new materials with innovative applications.
In the cover image: study of the sigma bond with X-ray diffraction. Credits: Yusuke Ishigaki
After nearly a year of review, on September 25, a study was published in Nature that has sparked a lot of discussion, especially among chemists. A group of researchers from Hokkaido University synthesized a molecule that experimentally demonstrated the existence of a new type of chemical bond, something that does not happen very often.
