Thermodynamic aspects ligand field stabilization energies LFSE

When a bridging ligand facilitates the coupling of electron spins on adjacent metal centres, the mechanism is one of superexchange. This is shown schematically in diagram 20.11, in which the unpaired metal electrons are represented in red. 

In a superexchange pathway, the unpaired electron on the first metal centre, Mj, interacts with a spin-paired pair of electrons on the bridging ligand with the result that the unpaired electron on M2 is aligned in an anti parallel manner with respect to that on Mj. 

9 Thermodynamic aspects ligand field stabilization energies (LFSE) 

---