How to measure CFSE practically and the factors affecting CFSE

Crystal field Stabilization Energy (CFSE) is defined as the decrease in energy by the preferential filling of electrons in lower laying d orbitals. CFSE can be calculated from the absorption spectra of the complex, as we know that coordination compounds are highly coloured complexes. And this colour of molecule comes from the d-d transition of electron.
This means the electrons from the t2g orbitals are excited to the eg orbitals and when they return to ground state they emit the radiation of equivalent energy. As the energy gap between them is 10Dq, so energy emitted by electron will be equal to 10Dq value.
The radiation emitted can be measured in absorption spectra of the molecule.
The absorption spectra of this complex is shown here and you can see that there is only one maxima at around 500nm wavelength. So from the wavelength absorbed, we can calculated energy by Planck - Einstine relation, which is,
E photon = hc / lambda
Factors affecting CFSE.
1. Geometry of the Complex: In octahedral complexes, the splitting of d orbitals is more than double as compared to the splitting in tetrahedral complexes for the same metal ion and ligands.
2. Nature of Ligands: As different ligands produce different strength of the field, they give rise to different splitting of d orbitals. E.g.
3. Charge on metal ion: Since crystal field theory is based on the electrostatic model, the ionic charge on the central metal has a direct effect on the magnitude of 10Dq. In general a metal ion with higher charge draws the ligands more closer, and hence produces more splitting than an ion with lower charge. e.g
4. Position of metal in transition series: Metals from different transition series uses different d orbitals like Co uses 3d orbital, Rh uses 4d orbital and Ir uses 5d orbitals for complex formation. Thus the value of 10Dq also changes depending upon the position of metal ion in transition series.

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