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Träfflista för sökning "(WFRF:(Glaser J)) srt2:(1995-1999)"

Sökning: (WFRF:(Glaser J)) > (1995-1999)

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  • Szabó, Zoltan, Associate professor, et al. (författare)
  • Application of 19F NMR spectroscopy to the study of equilibrium dynamics of uranyl(2+)‐fluoride complexes
  • 1995
  • Ingår i: Magnetic Resonance in Chemistry. - : Wiley. - 0749-1581 .- 1097-458X. ; 33:1, s. 20-26
  • Tidskriftsartikel (refereegranskat)abstract
    • One‐ and two‐dimensional magnetization‐transfer 19F NMR methods were applied in a quantitative study of the fluoride exchange for uranyl(2+)‐fluoride complexes in aqueous solution. The applicability of these techniques and the classical lineshape analysis is discussed, and the quality of the results (rate constants and relaxation rates) obtained by the three methods is compared.
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  • Öhrström, Lars, 1963, et al. (författare)
  • Protonation of pi-alkene-rhodium(I) complexes leads to sigma-alkyl-rhodium(III) - an NMR study
  • 1998
  • Ingår i: Journal of Organometallic Chemistry. ; 558:1-2, s. 123-130
  • Tidskriftsartikel (refereegranskat)abstract
    • The reaction of Rh(beta-diketonato)(alkene)(2) complexes with CF3SO3H in THF gives Rh(beta-diketonato)(alkyl) species when the alkene is ethylene, cis-butene or 5-methylene-cycloheptene whereas 1,5-cyclooctadiene complexes are unreactive. The reaction was followed by means of NMR-spectroscopy at low temperature and the products were characterized in solution by 2D-NMR techniques. Three possible reaction mechanisms are discussed: ligand assisted proton transfer, hydride transfer and direct protonation of the alkene. The Rh(III)ethyl species are stable against degradation by beta-hydride elimination. However, Rh(III)(beta-diketonato)(n-butyl) complexes lose butene rapidly when ethylene is added and Rh(beta-diketonato)(ethyl) complexes are formed. A mechanism preventing the formation of higher oligomers is proposed, where beta-hydride elimination is followed by rapid alkene exchange and hydride re-insertion. (C) 1998 Elsevier Science S.A. All rights reserved.
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