New neutral and cationic dicyclopentadienylniobium complexes
Authors
Urbanos Urbanos, Francisco Alejandro; Mena Montoro, Miguel; Royo Gracia, Pascual; Antiñolo García, AntonioIdentifiers
Permanent link (URI): http://hdl.handle.net/10017/4799DOI: 10.1016/0022-328X(84)80630-0
ISSN: 0022-328X
Publisher
Elsevier
Date
1984Funders
Comisión Asesora de Investigación Científica y Técnica
Bibliographic citation
Journal of Organometallic Chemistry, 1984, v.276, n.2, p.185-192
Keywords
Dicyclopentadienylniobium complexes
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
http://dx.doi.org/10.1016/0022-328X(84)80630-0Rights
© Elsevier, 1984
Access rights
info:eu-repo/semantics/openAccess
Abstract
(η5-C5H5)2NbX(PMe3) (X = Cl, Br) was prepared by reducing (η5-C5H5)2NbX2 with Na/Hg amalgam in the presence of PMe3. (η5C5H4Me)2TaCl(PMe3) was obtained analogously. The reaction of (η5-C5H5)2NbCl(PMe3) with AgBF4 gave metallic silver and cationic [η5-C5H5)2NbCl(PMe3)]+, which reacts with OPPh3 to give [(η5-C5H5)2Nb(OPPh3)(PMe3)]2+ Cationic halide complexes [(η5-C5H5)2NbClL]+ are also formed from (η5-C5H5)2NbCl2 by abstraction of chloride with AgBF4 in the presence of the ligand, L = CH3CN or OPPh3. When L is acrylonitrile, the dinuclear species {[(η5-C5H5)2NbCl]2(μ-CH2CHCN)}2+ is obtained. Attempts to isolate alkylniobium(III) complexes by alkylation of the corresponding halide complexes or by reduction of the haloalkylniobium(IV) derivatives were unsuccessful; no (η5-C5H5)2NbCl(CH2C6H5) was obtained and treatment of (η5-C5H5)2Nb(CH2C6H5)2 with halogen gave (η5-C5H5)2NbI2, (η5-C5H5)2NbBr3 and (η5-C5H5)2NbX2+X3− (X = Br, I).
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