Le tensioni in Ucraina che vedono coinvolti molti paesi, la pandemia e la cronaca quotidiana hanno nuovamente messo in secondo piano l'attenzione sui negoziati climatici. Riprendiamo le fila della COP26 e vediamo come gli attuali eventi geopolitici internazionali possono influenzare il cammino verso la COP27. Lo facciamo con Federico Brocchieri, esperto di negoziati climatici che ha partecipato alla COP26 per la trasparenza nel supporto alle azioni di mitigazione e adattamento, e con Jacopo Bencini, esperto di diplomazia climatica e policy advisor per Italian Climate Network.
Il cammino verso la COP27, tra tensioni ucraine e mutati scenari geopolitici
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Discovered a New Carbon-Carbon Chemical Bond
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.