RT info:eu-repo/semantics/article T1 Half-sandwich isocyanide, phosphine, methyl and phosphanido pentamethylcyclopentadienylniobium(V) complexes A1 Alcalde Adeva, María Isabel A1 Mata de la Mata, Francisco Javier de la A1 Gómez Rubio, Manuel A1 Royo Gracia, Pascual A1 Sánchez Rodríguez, Fernando K1 Niobium K1 Pentamethylcyciopentadienyl K1 Isocyanide K1 Phosphine K1 Phosphanido K1 Half-sandwich cpds K1 Ciencia K1 Química inorgánica K1 Science K1 Chemistry, inorganic AB [NbCp★Cl4] Cp★ = ν5-C5Me5) reacts with one molar equivalent of isocyanides and phosphines to give pseudo-octahedral adducts [NbCp★Cl4·L], (Full-size image (<1 K), 4) and the dinuclear complex [∗[NbCp★Cl4∗]2(μ-dmpe)], 5. Reactions of [NbCp★Cl4] with appropriate amounts of MgClMe yield the correspodning dimethyl [NbCp★Cl2Me2], 6, and tetramethyl [NbCp★Me4], 7 derivatives. Similarly, when [∗[NbCp★Cl3∗2(μ-O)] an and 3 are treated with the alkylating magnesium reagent, [∗[NbCp★Me3∗]2(μ-O)], 8, and [NbCp★Cl3Me(PMe2Ph)], 9, are obtained in high yields. A new phosphanido-niobium(V) complex [NbCp★Cl3(PPh2)] 10, is formed in the reaction of the starting tetrachloro complex with one equivalent of LiPPh2. All the complexes were characterized by IR and NMR spectroscopy, and most of them were studied by mass spectrometry. PB Elsevier SN 0022-328X YR 1995 FD 1995 LK http://hdl.handle.net/10017/3965 UL http://hdl.handle.net/10017/3965 LA eng DS MINDS@UW RD 28-mar-2024