Synthesis and structure of [Bi2(NtBu)4]2Li 2·2THF; a bimetallic cubane fragment containing a [Bi2(NtBu)4]2- anion

Andrew J. Edwards, Michael A. Beswick, Jane R. Galsworthy, Michael A. Paver, Paul R. Raithby, Moira Ann Rennie, Christopher A. Russell, Kerry L. Verhorevoort, Dominic S. Wright

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The imido-Bi complex [Bi2(NtBu)4]Li2 · 2THF (1) has been prepared by the in situ reaction of [(Me2N)Bi(μ-NtBu)]2 with [tBuNHLi] in toluene/THF solution. The complex has been characterised by elemental analysis, solid-state IR spectroscopy, 1H NMR spectroscopy in solution, and by a low-temperature (153 K) X-ray diffraction study. The complex crystallises in the monoclinic space group P21/n, with cell dimensions a = 11.158(2), b = 16.777(3), c = 17.239(3) Å, β = 92.45(3)°, V = 3224.2(10) Å3 and Z = 4. Molecules of 1 consist of discrete [Bi2Li2N4] cubane units in the solid state. Further association of these units into a structure akin to the previously characterised complex [Sb2(NCy)4]2Li4 (2), consisting of a cage of two interlocked 'broken cubes', is prevented by Lewis base solvation of Li. Solution NMR and cryoscopic studies of 2 show that the complex is involved in a dissociative equilibrium in which separate cubane units, similar to those identified in 1, are formed.

Original languageEnglish
Pages (from-to)9-14
Number of pages6
JournalInorganica Chimica Acta
Issue number1
Publication statusPublished - 1 Jul 1996


  • Bismuth complexes
  • Crystal structures
  • Cubane complexes
  • Imido complexes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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