Fluorine NMR spectra of hexafluorodisilane and hexafluorodisiloxane have been recorded and analyzed. The19Fsngbnd;19F and29Sisngbnd;19F spin coupling constants were obtained from the satellite spectra arising from the29Sihyphen;substituted molecules present in natural abundance. The ``near'' and ``far''29Sisngbnd;19F coupling constants in Si2F6were found to be of opposite sign.
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