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

Research output: Contribution to journalArticle

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
Publication statusPublished - 2009

Keywords

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

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