Synthesis and structure of a terminal uranium nitride complex

David M. King, Floriana Tuna, Eric J L McInnes, Jonathan McMaster, William Lewis, Alexander J. Blake, Stephen T. Liddle

Research output: Contribution to journalArticlepeer-review


The terminal uranium nitride linkage is a fundamental target in the study of f-orbital participation in metal-ligand multiple bonding but has previously eluded characterization in an isolable molecule. Here, we report the preparation of the terminal uranium(V) nitride complex [UN(Tren TIPS)][Na(12- crown-4) 2] {in which Tren TIPS = [N(CH 2CH 2NSiPr i 3) 3] 3- and Pr i = CH(CH 3) 2} by reaction of the uranium(III) complex [U(Tren TIPS)] with sodium azide followed by abstraction and encapsulation of the sodium cation by the polydentate crown ether 12-crown-4. Single-crystal x-ray diffraction reveals a uranium-terminal nitride bond length of 1.825(15) angstroms (where 15 is the standard uncertainty). The structural assignment is supported by means of 15N-isotopic labeling, electronic absorption spectroscopy, magnetometry, electronic structure calculations, elemental analyses, and liberation of ammonia after treatment with water.
Original languageEnglish
Pages (from-to)717-720
Number of pages3
Issue number6095
Publication statusPublished - 10 Aug 2012


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