Abstract
Molecular orbital valence bond (MOVB) theory suggests that, in addition to the well-known covalent and ionic mechanisms, there exist two distinct types of bonding: overlap dispersion (discussed in a previous paper) and ionic overlap induction where overlap is assisted by an overlap-independent coulomb binding mechanism. Ionic overlap induction is exemplified by the RLi tetramer in which the Li 4 unit relinquishes, e.g. one electron to the R 4 unit setting up an electric field which glues the four Li species in Li + 4by interstitializing the remaining three electrons. As a result, three R radicals can now make three interstitial covalent bonds with the Li + 4fragment with one R − becoming bound to the same fragment by ionic forces. Our analysis implies that there exists a well-defined and separate bonding mode which can exist only when electropositive metals are combined with electronegative nonmetals. One of the additionally cited illustrative examples is a CuO dimer of biological significance. This sets the stage for the eventual presentation of a theory of high temperature superconductivity based on these ideas.
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