The interior surfaces of fullerenes allow researchers the opportunity to isolate otherwise unstable metallic clusters. Now, a team of scientists from China and Germany has reported a new example of a fullerene cage stabilising a trimetallic carbide cluster, which features an unprecedented example of an all-lanthanide three-centre single-electron bond.
Shangfeng Yang from Hefei University of Science and Technology and colleagues used a common method to prepare their unusual trimetallic carbide clusterfullerene. Following arc discharge of a graphite and Dy2O3 mixture they were able to isolate Dy3C2@C80 by HPLC, which they could then co-crystallise with a corannulene-based host.
The researchers used x-ray crystallography to unambiguously locate the Dy3C2 cluster within the fullerene cage. However, their computational analysis revealed something quite unusual; the cluster contains a three-centre single-electron Dy–Dy–Dy bond, a bonding motif never before seen in molecular lanthanide chemistry.
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F Jin et al, Chem. Sci., 2021, DOI: 10.1039/d1sc00965f