Abstract
After recalling the basic physical backgrounds, we examine the concept of magnetic orbital, which is very useful for treating the mechanism of superexchange. Then we recall the general broad lines of the first historical model proposed by Anderson. In a second step, we develop a new general treatment for superexchange, in the case of the centrosymmetrical model AXB. A and B are 3d 1 metal cations characterized by σ-type bonds on both sides of the diamagnetic bridge X without the presence of a π-type orbital (with here A = B or A ≠ B). The cationic orbitals are of the d-type, whereas that of diamagnetic ligand is of the s- or p-type. This treatment allows one to retrieve the expression of exchange energy J vs key molecular integrals, as respectively proposed by several authors such as Anderson, on the one hand, Hay, Thibeault and Hoffmann, on the other one, and, finally, Kahn and Briat. This toy model may be easily generalized to 3d n ions (with n > 1) with or without transfer between both cations, with A ≠ B . Under these conditions we show that this general treatment allows one to calculate superexchange interactions in any type of molecule.
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Curély, J., Barbara, B. General Theory of Superexchange in Molecules. In: Winpenny, R. (eds) Single-Molecule Magnets and Related Phenomena. Structure and Bonding, vol 122. Springer, Berlin, Heidelberg. https://doi.org/10.1007/430_033
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