Ligand field stabilization energies models

In this approach the metal-ligand interaction is modeled with a metal-ligand bonding interaction term, ML, approximated by a Morse function, a cellular ligand field stabilization energy term, (which is responsible for the coordination... 

Among the early successes of crystal field theory was its ability to account for magnetic and spectral properties of complexes. In addition, it provided a basis for understanding and predicting a number of their structural and thermodynamic properties. Several such properties are described in this section from the crystal field point of view. Certainly other bonding models, such as molecular orbital theory, can also be used to interpret these observations. Even when they are, however, concepts from crystal field theory, such as crystal (or ligand) field stabilization energy, are often invoked within the discussion. 

A ligand field stabilization energy treatment accounts for the inertness of trivalent chromium complexes for ligand exchange. Is the phlogiston model applicable here If so, how ... 

If we examine the two five-coordinate shapes from a crystal field perspective, the d orbitals split in a different way to that found for octahedral, tetrahedral and square planar shapes since the d orbitals find the ligands in clearly different locations in space. The crystal field splitting pattern for the two is shown in Figure 4.14. From this pattern, crystal field stabilization energies can be calculated, and favour the square pyramidal geometry in all cases (apart from the trivial situations d° and d10) except for high spin d5. This prediction differs from the outcome from the electron pair repulsion model. 

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