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Rare three-atom bismuth ring identified
- Researchers stabilised a rare three-atom bismuth ring (Bi3) inside inverse-sandwich complexes using uranium or thorium.
- The Bi3 ring exhibits aromatic behavior in the heaviest known 6p system with measurable ring currents.
- Sigma-aromaticity dominates the ring currents, linking organic aromaticity to all-metal clusters.
- The study reports the heaviest aromatic ring ever identified.
- Actinide chemistry is expanded by stabilizing Bi3 with uranium and thorium.
- X-ray crystallography confirmed the geometry of the Bi3 ring.
- Magnetic measurements and spectroscopy supported the ring-current evidence.
- The discovery bridges concepts between organic chemistry and heavy-element science.
- The research used diuranium and dithorium complexes to stabilise the Bi3 unit.
- The findings offer new possibilities for designing metal-based clusters.
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