[FeCl6]4-, what is the d electron count? Use the appropriate Tanabe-Sugano Diagram Predict the spin-allowed electronic transitions for [FeCl6]4-

What changes would you expect if the Cl- ligands were changed to CN- ligands? What would be the approximate wavelength (in nm) of the 5T2g to 5Eg transition in a complex with Δo = 13,700 cm-1 and B = 1,370 cm-1?
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