Journal article
29Si and 19F MAS NMR spectra of isolated 29Si(19F)2 and 29Si(19F)3 spin systems: experiments and simulations.
Publication Details
Authors: | Helluy, X.; Pietschnig, R.; Sebald, A. |
Publisher: | Elsevier Science |
Publication year: | 2003 |
Journal: | Solid State Nuclear Magnetic Resonance |
Pages range : | 286-300 |
Volume number: | 24 |
Start page: | 286 |
End page: | 300 |
ISSN: | 0926-2040 |
eISSN: | 1527-3326 |
DOI-Link der Erstveröffentlichung: |
Abstract
We consider 29Si and 19F MAS NMR spectra of isolated 29Si(19F)2 and 29Si(19F)3 spin systems in two organosilicon compds. of the type RR'SiF2 and RSiF3(R,R'=org. ligands). Exptl. spectra are analyzed by means of numerical simulations. It is found that the SiF3 group in RSiF3 is reorienting rapidly around the mol. Si-C bond direction in the solid state. The two 19F shielding tensors in RR'SiF2 have strongly differing orientations relative to the two Si-F bond directions in the mol. Possibilities and limitations of straightforward MAS NMR approaches for the full characterization of 29Si(19F)2 and 29Si(19F)3 spin systems and other dipolar coupled two and three-spin systems are discussed. [on SciFinder(R)]
We consider 29Si and 19F MAS NMR spectra of isolated 29Si(19F)2 and 29Si(19F)3 spin systems in two organosilicon compds. of the type RR'SiF2 and RSiF3(R,R'=org. ligands). Exptl. spectra are analyzed by means of numerical simulations. It is found that the SiF3 group in RSiF3 is reorienting rapidly around the mol. Si-C bond direction in the solid state. The two 19F shielding tensors in RR'SiF2 have strongly differing orientations relative to the two Si-F bond directions in the mol. Possibilities and limitations of straightforward MAS NMR approaches for the full characterization of 29Si(19F)2 and 29Si(19F)3 spin systems and other dipolar coupled two and three-spin systems are discussed. [on SciFinder(R)]
Keywords
silicon fluorine MAS NMR organosilicon compd
