Why does charge transfer reduce the covalent component of a heteropolar bond?

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SUMMARY

The discussion centers on the relationship between charge transfer and the covalent component of heteropolar bonds, as articulated by Marvin L. Cohen in "THE THEORY OF REAL MATERIALS." Specifically, it is established that charge transfer diminishes the covalent character of these bonds, leading to a reduction in the bond strength denoted as B0. The example of H2 illustrates this concept, where transferring an electron results in an ionic structure (H^+ H^-), highlighting the ionic contributions to the bond.

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In THE THEORY OF REALMATERIALS(Annu. Rev. Mater. Sci. 2000. 30:1–26),

Marvin L. Cohen states that

"Because charge transfer reduces the covalent component of a heteropolar bond, B0 is also reduced."

Can you explain that connection between charge transfer and covalent component of a heteropolar bond? or give me a some ref?
 
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Well, take for example H2. If you transfer an electron from one H to the other you end up with a valence bond structure H^+ H^-, i.e. an ionic structure. Hence charge transfer is much the same as saying that there are ionic contributions to the bond.
 

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