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'Shift Reagents' in keywords Facet   Publication Year 1984  [X]
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1984[X]
1Author    O. Tto, O. Lfb, Onowara Begum2, Hans GeigerbRequires cookie*
 Title    Fluorescence Properties of Hydroxy-and Methoxyflavones and the Effect of Shift Reagents  
 Abstract    The fluorescence spectra o f 42 hydroxy-and m ethoxyflavones in m ethanol solution have been investigated. The follow ing findings are considered to be useful in structure elucidation and identification o f flavonoids: (a) The maxima of the absorption and fluorescence bands give, in m ost cases, a unique combination; (b) flavones exhibit exceptionally large Stok es' shifts (6,800 to 
  Reference    Z. Naturforsch. 39b, 231 (1984); received Septem ber 23 1983 
  Published    1984 
  Keywords    Flavonoids, F luorescence, Structure Elucidation, Shift Reagents 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0231.pdf 
 Identifier    ZNB-1984-39b-0231 
 Volume    39 
2Author    O. Tto, S. W. Olfbeis, Eva Fiirlinger3, HemC. Handra Jhab, Fritz ZillikenbRequires cookie*
 Title    The Absorption and Fluorescence of Isoflavones and the Effect of Shift Reagents  
 Abstract    The absorption and fluorescence maxima o f 20 isoflavones have been determ ined in methanol solution and the effect o f addition o f w ater, 50% sulfuric acid, aluminium trichloride, borax, sodium acetate, ammonia and sodium hydroxide has been studied. The following findings may be useful in the structure elucidation o f naturally occurring isoflavones: (a) 5-Hydroxyisoflavones have band I absorption maxima around 335 nm. 6-hydroxyisoflavones betw een 310 and 330 nm, 
  Reference    Z. Naturforsch. 39b, 238 (1984); received Septem ber 23 1983 
  Published    1984 
  Keywords    Isoflavonoids, F luorescence, A bsorption, Shift Reagents 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0238.pdf 
 Identifier    ZNB-1984-39b-0238 
 Volume    39