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'11B N M R Spectra' in keywords Facet   Publication Year 1990  [X]
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1990[X]
1Author    W. Preetz, M. StallbaumRequires cookie*
 Title    Darstellung und "B-NMR-Spektren perhalogenierter c/oso-Hexaborate B«X"Y6."2-, n = 0 -6 ; X * Y = Cl, Br, I  
 Abstract    The mixed halogenohexaborates B6X"Y6_"2~, n = 1 -5 ; X ^ Y = Cl, Br, I, including most o f the pure stereoisomers for n = 2 -4 , are prepared for the first time by treatment o f the halo-hydrohexaborates B6X"H6_"2~, X = Cl, Br in aqueous alkaline solution with bromine and iodine or with halogenosuccinimides. The point symmetry is determined from the "B N M R spectra, which show characteristic features for hom ologous isostructural compounds. In the systems B6X"Y6_n2_ a considerable dispersion o f the "B signals is observed, for B(X) atoms to lower, for B(Y) atoms to higher field compared with B6X 62_ and B6Y 62~ (electronegativity X > Y), respectively. An additional chemical shift is caused by the mutual antipodal effect between pairs o f opposite B atom s carrying different substituents. From the systematic influ­ ences on the chemical shifts the "B N M R spectra o f the missing species fac-B6X 3Y 32_ are cal­ culated. 
  Reference    Z. Naturforsch. 45b, 1113—1117 (1990); eingegangen am 6. März 1990 
  Published    1990 
  Keywords    Mixed Halogenohexaborates, 11B N M R Spectra, A ntipodal Effect 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1113.pdf 
 Identifier    ZNB-1990-45b-1113 
 Volume    45