Respuesta :
In an octahedral complex, when Δ is large (strong field ligand), the electrons will first fill the lower energy d orbitals before any electrons are placed on the higher energy d orbitals. It is then classified as low spin because there is a minimal amount of unpaired electrons.
Strong field ligands are ones that produce large splittings between the d orbitals and form low spin complexes.
Examples of strong field ligands include CO, CN-, and NO2.
How do you determine a strong field ligand?
It depends on the central atom , cordination number , oxidation state. If cordination number is 6 (octahedral) and having +2 oxidation state then it is weak ligand and in +3 oxidation state it is strong ligand. If cordination number is 4 (tetrahedral) then it is weak ligand.
Learn more about strong field ligands here:
