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'Isomeric Halohydrododecaborates' in keywords
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1984 (1)
1Author    H.-G Srebny, W. Preetz, H. C. MarsmannRequires cookie*
 Title    Darstellung, n B-NMR-und Schwingungsspektren isomerenreiner Halogenohydrododecaborate X"B12H12 _n2_; X = CI  
 Abstract    , n = 1—3; X = Br, n = 1,2; X = I, n = 1 Preparation, nB NMR and Vibrational Spectra of Pure Isomeric Halohydrododecaborates X"B12H 12_"2-; X = Cl, n = 1 -3 ; X = Br, n = 1,2; X = I, n = 1 Pure isomers of X"B12H 12_"2_; X = Cl, Br, I are isolated by ion exchange chromatography on diethylaminoethyl cellulose. The structures are determined by " B and " B l'H jN M R spectro­ scopy. With X = Cl, Br the signal of ipso-B atomes is shifted to lower, with X = I to higher field compared with B 12H 122~. The resonances of B-atoms influenced by the antipodal effect are ob­ served at high field, increasing within the series I< B r< C l. The chemical shifts are explained by the anisotropy effect and by the paramagnetic term due to different —I and +M effects of the halogens. In agreement with theoretical predictions the substitution of B 12H 122~ with chlorine proceeds successively at vicinal positions B (l) —B(2) —B(3). The IR and Raman spectra of 1-XBi2H u2~ show in the region 175 — 380 cm -1 two characteristic bands shifting to lower frequen­ cies in the series Cl, Br, I and are therefore assigned to (B 12) -X stretching and (B 12) -X bending modes, respectively. 
  Reference    Z. Naturforsch. 39b, 189 (1984); eingegangen am 13. Oktober 1983 
  Published    1984 
  Keywords    Isomeric Halohydrododecaborates, UB and "B{'H }NM R Spectra, IR Spectra, Raman Spectra 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0189.pdf 
 Identifier    ZNB-1984-39b-0189 
 Volume    39