I have a question about this molecule (bodipy) and B-N bonds

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I have a question relating this molecule (bodipy) :

pic_bodypystr.jpg

How do modern empirical models in chemistry explain the B-N bonds in this compound? Maybe we should consider this bond as having bond order = 0.5?
The same story with metalloporphyrins.
 
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Why 0.5? What’s the problem with 1?
 

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