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Chemistry · Glossary

What is Crystal-field stabilisation energy?

Definition 19.5 University Chemistry — Year 2 · Chapter 19 — Ligand Field Theory and Colour

The crystal-field stabilisation energy (CFSE) of a configuration t2gaegbt_{2g}^ae_g^b is (−0.4a+0.6b)Δo(-0.4a + 0.6b)\Delta_o, the energy of the d electrons relative to the barycentre (the pairing energies counted separately).

Left: crystal-field stabilisation energy along the d series (computed), high spin (solid) and low spin (dashed). Right: the two configurations of a d6 ion: four unpaired electrons when _o < P (as [Fe(H2O)6]2+), none when _o > P (as [Fe(CN)6]4-). Left: crystal-field stabilisation energy along the d series (computed), high spin (solid) and low spin (dashed). Right: the two configurations of a d6 ion: four unpaired electrons when _o < P (as [Fe(H2O)6]2+), none when _o > P (as [Fe(CN)6]4-).
Left: crystal-field stabilisation energy along the d series (computed), high spin (solid) and low spin (dashed). Right: the two configurations of a d6d^6 ion: four unpaired electrons when Δo<P\Delta_o < P (as [Fe(HX2O)X6]X2+\ce{[Fe(H2O)6]^2+}), none when Δo>P\Delta_o > P (as [Fe(CN)X6]X4−\ce{[Fe(CN)6]^4-}).
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