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SF4 using VSEPR
Hi,
The molecule sulphur tetrafluoride is approximately disphenoidal in shape (based on a trigonal bipyramid but with an equatorial lone pair). I'm happy with predicting this using VSEPR, but I don't understand why the axial fluorine - sulphur - axial fluorine angle is 173 degress, rather than exactly 180. Can this be explained using VSEPR theory?
Thanks for your help,
Will
The molecule sulphur tetrafluoride is approximately disphenoidal in shape (based on a trigonal bipyramid but with an equatorial lone pair). I'm happy with predicting this using VSEPR, but I don't understand why the axial fluorine - sulphur - axial fluorine angle is 173 degress, rather than exactly 180. Can this be explained using VSEPR theory?
Thanks for your help,
Will
StrictlyforProfit
Hi,
The molecule sulphur tetrafluoride is approximately disphenoidal in shape (based on a trigonal bipyramid but with an equatorial lone pair). I'm happy with predicting this using VSEPR, but I don't understand why the axial fluorine - sulphur - axial fluorine angle is 173 degress, rather than exactly 180. Can this be explained using VSEPR theory?
Thanks for your help,
Will
The molecule sulphur tetrafluoride is approximately disphenoidal in shape (based on a trigonal bipyramid but with an equatorial lone pair). I'm happy with predicting this using VSEPR, but I don't understand why the axial fluorine - sulphur - axial fluorine angle is 173 degress, rather than exactly 180. Can this be explained using VSEPR theory?
Thanks for your help,
Will
The three equatorial pairs are not equal. The repulsion felt from the lone pair is greater than from the two bonding pairs. This has the effect of bending the F-S-F axial bond towards the bonding pairs and away from the lone pair. It is therefore less than 180º
Of course, thanks. 
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