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'Trifluoromethyl Group' in keywords Facet   section ZfN Section B:Volume 036  [X]
Facet   Publication Year 1981  [X]
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1981[X]
1Author    Willy GomblerRequires cookie*
 Title    NMR-spektroskopische Untersuchungen an Chalkogenverbindungen, II [1] 12o Te-, 77 Se-, 19 F-und 13 C-chemische Verschiebungen von CF3-substituierten Selen-und Tellurverbindungen [2] NMR Spectroscopic Studies on Chalcogen Compounds, II [1] 125 Te, 77 Se, »F and * 3 C Chemical Shifts of CF3 Substituted Selenium and Tellurium Compounds [2]  
 Abstract    77 Se chemical shifts of compounds CF3SeX exhibit an extraordinary good linear correla-tion with Huggins' electronegativities of X, %x-A range of 1051 ppm is covered for yx values between 1.9 and 3.15. Effective electronegativities are derived from the <5(77 Se) values. For some compounds unexpected 77 Se chemical shifts are found. This indicates an uncommon electronic constitution at selenium. Electron excitation energies are reported for some of the compounds and their importance for the paramagnetic shielding term is discussed. The relative shieldings of the tellurium compounds are analogous to those of the corresponding selenium compounds. In contrast to 77 Se, the 19 F shieldings of CF3EX compounds (E = chalcogen) depend inversely on the electronegativity of E and X. The 13 C chemical shifts do not correlate with the xx values. NMR data of some CF3Se(IV) and CF3Te(IV) compounds are also reported for comparison. 
  Reference    Z. Naturforsch. 36b, 535—543 (1981); eingegangen am 21. Januar 1981 
  Published    1981 
  Keywords    NMR Spectra, Trifluoromethyl Group, Selenium, Tellurium 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0535.pdf 
 Identifier    ZNB-1981-36b-0535 
 Volume    36