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Chemistry · Glossary

What is Correlation diagram?

Definition 18.6 University Chemistry — Year 3 · Chapter 18 — Electronic Spectra and Magnetism of Complexes

A correlation diagram joins the states of a system in two limiting situations, here the free-ion terms split by a weak field and the configurations t2gaegbt_{2g}^ae_g^b of a strong field, connecting states of the same symmetry without letting two of them cross.

Correlation diagram of the triplet states of a d2 ion in an octahedral field. Each weak-field term goes to the strong-field configuration of the same symmetry, and the two 3T_1g states do not cross: the lower goes to t_2g2, the upper to t_2ge_g.
Correlation diagram of the triplet states of a d2d^2 ion in an octahedral field. Each weak-field term goes to the strong-field configuration of the same symmetry, and the two 3^3T1g_{1g} states do not cross: the lower goes to t2g2t_{2g}^2, the upper to t2gegt_{2g}e_g.
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