Sunday, December 8, 2019

inorganic chemistry - Why does ozone have an electrostatic potential map similar to that of SO2?


This is the electrostatic potential for ozone.


Electrostatic potential map of ozone


This is the electrostatic potential for sulfur dioxide.


SO2

(Click to enlarge)


They look almost exactly the same except one is all oxygen atoms and the other has sulfur in the center instead of oxygen.


Why does ozone have an MEP (molecular electrostatic potential) similar to that of SO2?



Answer



Resonance structures of SOX2 and OX3.


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As you can see from the diagram OX3 and SOX2 are isoelectric and have the same shape and this accounts for their very similar electrostatic potential maps. Both molecules are polar although SOX2, with a dipole moment of 1.62D, is more polar than OX3 (0.53D). As the diagram shows, the polarity of both molecules is due to the their trigonal planar shape with a formal positive charge on the central atom.


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