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'27 A1 NMR Spectra' in keywords Facet   Publication Year 1987  [X]
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1987[X]
1Author    Stanislav Heřmánek, Jiří Fusek, Otomar Kříž, Bohuslav Čásenský, Zbynĕk ČernýRequires cookie*
 Title    Alkoxohydridoaluminates. I 27 AI NMR Characteristics of (C 4 H9) 4 N + AlH4_"(OR)"" in Benzene  
 Abstract    The 27 A1 NMR spectra of (C 4 H 9) 4 N + AlH 4 _ n (OR)"-prepared in the reaction of (C 4 H 9) 4 NA1H 4 with ROH (R -CH 3 , C 2 H 5 , /-C 3 H 7 , r-C 4 H 9 , «-C 5 H U , n-C 9 H 19 , cyclo-C 6 U n , C 6 H 5 , CH 3 OCH 2 CH 2) in benzene show — in contrast to the Li + and Na + salts — a distinct H-splitting, which has allowed to ascertain: 1) the presence of all members (n = 0—4) in solution, 2) the Al chemical shift and AI —H coupling constant of all individual classes, namely (n = 0): 101.6 ppm, quintet 174 Hz; (n = 1): 114-123 ppm, quartet 184-193 Hz; (n = 2): 103-112 ppm, triplet 197-219 Hz; (n = 3): 75-91 ppm, doublet 218-237 Hz; (n = 4): 51-73 ppm, singlet, 3) in-creased shielding in the order: CH 3 < n-R = i-R = sec-R < C 6 H U C 6 H 5 < r-C 4 H 9 . The anomalous "sagging" pattern of the curve: d 27 Al vs. number of OR groups, is interpreted on the basis of significant differences among Al and H and OR in electronegativity. 
  Reference    Z. Naturforsch. 42b, 539—545 (1987); received October 1 1986 
  Published    1987 
  Keywords    Tetrahydridoaluminates, Alkoxohydridoaluminates, Tetraalkoxoaluminates, 27 A1 NMR Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0539.pdf 
 Identifier    ZNB-1987-42b-0539 
 Volume    42