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Discuss briefly how crystal field theory...

Discuss briefly how crystal field theory explains the magnetic properties of complexes of transition metals.

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Transition metal complexes exhibit magnetic properties. The magnetic nature depends on the number of unpaired electrons present. On this basis, these complexes can be paramagnetic (having unpaired electrons) in nature.
Magnetic nature or amgnetic moment can be determined by the relatiion, `mu=sqrt(N(N+2))` BM where, N is the number of unpaired electrons.
Presence of unpaired electrons can be explained with the help of crystal field theory.
For instance, `[Fe(H_(2)O)_(6)]^(2+)` is paramagnetic but `[Fe(CN)_(6)]^(4+)` is diamagnetic in nature.
This can be explained as, since, `H_(2)O` is a weak field ligand, it does not pair up the electrons and forms high spin complex. While `CN^(-)` is a strong field ligand, pairs the elctrons and forms low spin complex.
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