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|Type:||Artigo de periódico|
|Title:||Surface Organometallic Chemistry Of Vanadium(v): Reactivity Of (butn=)vnp3 Towards Silica|
|Abstract:||The reaction of (ButN=)VNp3 towards silica dehydroxylated at 773 K was studied by in situ FT-IR, 13C CP-MAS NMR, 51V 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 (SiO)2V(=NBut)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 SiO-V bonds, elimination of NH2But and formation of ionic surface species, [SiO]-[ButNH3]+. © 2001 Elsevier Science B.V.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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