Three-atom bismuth ring reveals new form of aromaticity

Structure

Source: © Junru Ding et al 2026

All-metal ring is the heaviest analogue of an aromatic three-membered ring

Scientists have created complexes with aromatic three-atom bismuth rings that are stabilised by heavy actinide atoms. These all-metal rings are the heaviest examples of this type of molecule and challenge the idea that aromaticity is limited to carbon-based molecules.