| | 1 | Author
| Willy Gombler | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0535.pdf | | | | Identifier
| ZNB-1981-36b-0535 | | | | Volume
| 36 | |
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