Unlike transition metal complexes, the colors of lanthanoid(III) complexes are generally not affected by the nature of the ligands. The primary reason for this behavior is that:

Question

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Correct answer: A. the 4f orbitals are deeply buried and effectively shielded by 5s and 5p electrons.

The colors of lanthanoid(III) complexes arise mainly from

f-f

transitions.

The

4f

orbitals in lanthanoids are deeply buried inside the atom and are effectively shielded from the external environment by the filled

5s

and

5p

orbitals.

Due to this shielding, the

4f

electrons do not interact significantly with the ligands.

Consequently, the crystal field splitting of the

4f

orbitals is very small, and the energy levels of the

4f

orbitals are largely unaffected by the nature of the ligands.

Thus, the colors of lanthanoid(III) complexes remain essentially the same regardless of the ligands present.

Answer: the

4f

orbitals are deeply buried and effectively shielded by

5s

and

5p

electrons.

Unlike transition metal complexes, the colors of lanthanoid(III)...

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