Temperature dependence of 77Se, 125Te, and 19F shielding and M-induced 19F isotope shifts in MF6 molecules

Abstract

The high resolution NMR spectra of 77Se, 125Te, and 19F nuclei in SF6, SeF6, TeF6, and WF6 molecules are measured as functions of density and temperature in the pure liquid and in the dilute gas. The 19F chemical shifts between the isotopomers of these molecules are observed in all but WF6, and the m′MF6–mMF6 shifts exhibit a strict proportionality to the mass factor (m′–m)/m′.