Covalent bonds in α-SnF₂ monitored by J-couplings in solid-state NMR spectra

Thomas Braeuniger (1) , Stefan Ghedia (1) , Martin Jansen (1)

1 Max-Planck-Institut für Festkörperforschung

The stable ambient-temperature phase of tin(II) fluoride, α-SnF₂, has been studied by ¹⁹F and ¹¹⁹Sn magic-angle spinning (MAS) NMR spectroscopy. A large chemical shift anisotropy (CSA) is observed in the spectra of both nuclides, which is indicative of the presence of stereochemically active lone electron pair on Sn. Symmetric satellite lines with low intensity have been detected in the ¹¹⁹Sn MAS spectra acquired under ¹⁹F decoupling, and are assigned to indirect J-couplings between the magnetically active Sn isotopes. The detection of J-couplings is evidence for the existence of genuine covalent bonds in α-SnF₂, a fact which has been deduced before from X-ray crystallography, which revealed the presence of Sn--F distances smaller than the sum of the respective ionic radii.

Mots clés: Physical Sciences

Thomas Braeuniger, Stefan Ghedia, Martin Jansen. Covalent bonds in α-SnF₂ monitored by J-couplings in solid-state NMR spectra. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2010, 636 (13-14), pp.2399. ⟨10.1002/zaac.201000176⟩. ⟨hal-00567268⟩