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VSEPR calculation for hexafluorophosphate, [PF6]-

For hexafluorophosphate, [PF6]-, there are six bonded groups and so no lone pairs. This anion is useful in synthesis since it often aids the crystallization of bulky cations by providing a reasonable size match for the cation. Note that the negative charge for the purposes of the calculation is placed on phosphorus for the purpose of the calculation even though the negative charge is in reality delocalized over all seven atoms of the ion.

hexafluorophosphate, [PF6]-
Lewis structure: PF6anion.gif
Central atom: phosphorus
Valence electrons on central atom: 5
6 F each contribute 1 electron: 6
Add one for the negative charge on P 1
Total: 12
Divide by 2 to give electron pairs 6
6 electron pairs: octahedral geometry for the six shape-determining electron pairs
PF6anion
The geometry of hexafluorophosphate, [PF6]-. You can use your mouse to manipulate the molecule in the right hand "Jmol" image.

A VSEPR tutorial on the WWW

VSEPR tutorial on the WWW, URL: http://winter.group.shef.ac.uk/vsepr/
Copyright 1996-2015 Prof Mark Winter [The University of Sheffield]. All rights reserved.
Document served: Friday 28th April, 2017