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'Carbonylphosphinevanadium' in keywords Facet   Publication Year 1982  [X]
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1Author    Dieter Rehder, Hans-Christoph Bechthold, Ahmet Keçeci, Hartwig Schmidt, Michael SiewingRequires cookie*
 Title    A Comparative Study of Metal Shielding in Low Valent Vanadium, Niobium and Manganese Complexes  
 Abstract    Variations of the metal chemical shifts <5(51 V), <5(55 Mn) and <S(93 Nb) with the para-magnetic deshielding contribution to the overall shielding are discussed in terms of influences imposed by the ligand field splitting, the nephelauxetic effect and the covalency of the metal-to-ligand bond. Complexes under investigation are isoelectronic and/or iso-structural series [M(CO)6_nL"]<i (M = V, Nb: q = —1; M = Mn: q = + 1; n = 0-6), 7? 5 -C5H5M(CO)4-KLn (M = V, Nb; n = 0-4) and r? 5 -C5H5M(L /)2L (M = V, L' = NO; M = Mn, L' = CO). L is a monodentate or l/n oligodentate phosphine. <5 varies with the point symmetry of the complex, and with ligand parameters of primarily electronic or steric origin. Generally, for weak to medium ^-interaction, there is a decrease of shielding with decreasing yr-acceptor power of the ligand, increasing ligand bulkiness, increasing ring strains in chelate structures and increasing degree of substitution. For strong ^-inter-action, the trends may be interconverted. PF3 is shown to be a slightly weaker 7r-acceptor than CO. Selected results on nuclear-spin spin coupling constants, 13 C and 31 P shielding are also presented. 
  Reference    Z. Naturforsch. 37b, 631—645 (1982); eingegangen am 25. November 1981 
  Published    1982 
  Keywords    Carbonylphosphinevanadium, Carbonylphosphineniobium, Carbonylphosphinemanganese, NMR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0631.pdf 
 Identifier    ZNB-1982-37b-0631 
 Volume    37