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Octahedral Metal Complexes

For octahedral complexes that possess between 4 and 7 d electrons, there are two different ways to distribute the electrons.

Depends on the energy ‘gap’.

Illustrate for Fe(H2O)63+ (five electrons).

High-spin versus low-spin.

If the energy gap is large enough, all the electrons will be placed in the t2g (low-spin).

If the energy gap is small, five electrons will be paired in each orbital first (low-spin and high-spin).

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