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Sep23-11, 01:51 AM
Sci Advisor
P: 3,596
Think of it as a hole occupying a p orbital. A p orbital is higher in energy than an s orbital or a sp hybrid. So it is energetically advantageous for the hole being in a pure p orbital than in an sp hybrid.
Alternatively you can say that using sp2 for the bonds you maximize the occupancy of the low lying s orbital.