[2][1] Compounds with disphenoidal (see-saw) geometry have two types of ligands: axial and equatorial.

Disphenoidal molecules, like trigonal bipyramidal ones, are subject to Berry pseudorotation in which the axial ligands move to equatorial positions and vice versa.

This exchange of positions results in similar time-averaged environments for the two types of ligands.

Thus, the 19F NMR spectrum of SF4 (like that of PF5) consists of single resonance near room temperature.

[4] Sulfur tetrafluoride is the premier example of a molecule with the disphenoidal molecular geometry (see image at upper right).