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Science 16 September 2005:
Vol. 309. no. 5742, pp. 1835 - 1838
DOI: 10.1126/science.1116452
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Reports

Molecular Octa-Uranium Rings with Alternating Nitride and Azide Bridges

William J. Evans,* Stosh A. Kozimor, Joseph W. Ziller

Uranium nitrides offer potential as future nuclear fuels and as probes of metal ligand multiple bonding involving the f-block actinide metals. However, few molecular examples are available for study owing to the difficulties in synthesis. Recent advances in organoactinide chemistry have provided a route to uranium nitride complexes that expands the options for developing UN chemistry. Several 24-membered uranium nitrogen rings, (UNUN3)4, have been synthesized by reduction of sodium azide with organometallic metallocene derivatives, [(C5Me4R)2U][(µ-Ph)2BPh2] (R = Me, H; Me = methyl, Ph = phenyl). The nanometer-sized rings contain unusual UNU nitride linkages that have short U-N distances within the double-bond range.

Department of Chemistry, University of California, Irvine, CA 92697–2025, USA.

* To whom correspondence should be addressed. E-mail: wevans{at}uci.edu

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