[Wien] Exchange energy

[Alex]

Deal all,

I remember the below sentence from a paper which unfortunately I can not
find it again; It was about a solid constructed by a transition metal(3d)
and an element from the p block (probably Ga, Al or B).

"Any gain in the d-p bond energy is accompanied by a loss in absolute value
of exchange energy."

Now, I was wondering how this sentence is true? or what is the relation
between the gaining in d-p orbital bond energy and losing the exchange
energy?

Thanks and regards,
Alex
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