Is #SF_4# electron precise?

1 Answer
Nov 5, 2016

Answer:

As far as I know, the Lewis structure of #SF_4#, which is a very nasty molecule, is electron precise.

Explanation:

The electron pairs around sulfur in #SF_4# adopt a trigonal planar geometry to give a #"see-saw"# molecular geometry in which axial and equatorial fluoride ligands have a soft mechanism of exchange by pseudorotation.

The singlet observed in the room temperature #""^19F# #NMR# spectrum of the molecule reflects this exchange, however, these can be frozen out at lower temperature.