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Type: Artigo de periódico
Title: Surface organometallic chemistry of vanadium(V): reactivity of (Bu(t)N=)VNp3 towards silica
Author: Wolke, SI
Buffon, R
Rodrigues, UP
Abstract: The reaction of (Bu 'N=)VNp3 towards silica dehydroxylated at 773 K was studied by in situ FT-IR, C-13 CP-MAS NMR, V-51 MAS NMR, ESR, chemical analysis of the evolved gases and chemical reactivity. Upon heating at 323 K under static vacuum at least four surface organometallic vanadium species are formed. However, after treatment at 373 K under vacuum (drop SiO)(2)V(=NBu ' )Np (B) appears to be the major surface species. This species reacts with neopentane, at 423 K, via a C-H addition to the V=N bond. Heating of B under hydrogen does not lead to surface vanadium hydride species but, presumably, to hydrogenolysis of drop SiO-V bonds, elimination of NH2Bu ' and formation of ionic surface species, [drop SiO]-[Bu ' NH3](+). (C) 2001 Elsevier Science B.V. All rights reserved.
Subject: surface organometallic chemistry
Country: Suíça
Editor: Elsevier Science Sa
Rights: fechado
Identifier DOI: 10.1016/S0022-328X(00)00908-6
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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