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

Reis, Dayane M., Westrup, Kátia Cristina M, Nunes, Giovana G., Barison, Andersson, Ribeiro, Ronny R., de Sá, Eduardo L., Hughes, David L. and Soares, Jaísa F. (2009) Vanadium-lithium alkoxides:Synthesis, structure, spectroscopic characterisation and accidental degradation of silicone grease. Journal of the Brazilian Chemical Society, 20 (4). pp. 613-626. ISSN 0103-5053

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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.

Item Type: Article
Uncontrolled Keywords: alkoxide,lithium,neopentoxide,silicone grease,vanadium(iv),chemistry(all) ,/dk/atira/pure/subjectarea/asjc/1600
Faculty \ School: Faculty of Science > School of Chemical Sciences and Pharmacy
Faculty of Science > School of Chemistry
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Depositing User: Pure Connector
Date Deposited: 23 Jun 2016 23:10
Last Modified: 22 Apr 2020 00:53
URI: https://ueaeprints.uea.ac.uk/id/eprint/59542
DOI:

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