Vanadium-lithium alkoxides: Synthesis, structure, spectroscopic characterisation and accidental degradation of silicone grease

Dayane M. Reis, Kátia Cristina M. Westrup, Giovana G. Nunes, Andersson Barison, Ronny R. Ribeiro, Eduardo L. de Sá, David L. Hughes, Jaísa F. Soares

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12 Citations (Scopus)

Abstract

Two complexes containing both vanadium and lithium, [V6Li10O8(ONep)14{OSi(Me)2 (ONep)}2] (1) and [V(ONep)3(μ-ONep)2Li(thf)2] (2), Nep = neopentyl, Me = methyl and thf = tetrahydrofuran, have been isolated in high yield and characterised by a number of techniques including X-band electron paramagnetic resonance (EPR) and 29Si{1H} nuclear magnetic resonance (NMR) spectroscopies, magnetic susceptibility measurements and single crystal X-ray diffractometry. Despite the similar preparation conditions, the two products present remarkably distinctive structural features: complex 2 is a binuclear adduct of "V(ONep)4" and "Li(ONep)(thf)2", while 1 is a mixed-valence, 16-metal aggregate. The large molecular oxoalkoxide 1 also contains silanolate units, {OSi(Me2)(ONep)} -, produced by nucleophilic attack of neopentoxide groups on Si-O bonds of silicone grease accidentally dissolved in the reaction media. Both products have promising applications in organic and inorganic synthesis, including the preparation of uncommon V-Li and/or Si containing oxides.

Original languageEnglish
Pages (from-to)613-626
Number of pages14
JournalJournal of the Brazilian Chemical Society
Volume20
Issue number4
DOIs
Publication statusPublished - 2009

Keywords

  • Alkoxide
  • Lithium
  • Neopentoxide
  • Silicone grease
  • Vanadium(IV)

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