Question
What are the high-spin and low-spin complexes?
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Answer
(1) High spin complex (HS) :
- The complex which has greater iwmher of unpaired electrons and hence a higher value of resultant spin and magnetic moment is called high spin (or spin free) or IlS complex.
- It is formed with weak field ligands and the complexes have lower values for crystal field splitting energy $(CFSE). \triangle _0$
- The paramagnetism of HS complex is larger.
- The complex which has the Icasi number of unpaired electrons or all electrons paired and hence the lowest
(or no) resultant spin or magnetic moment is called low spin (or spin paired) or LS complex. - It is formed with strong tickl ligands and the complexes have higher values of crystal field splitting energy $(Δ_0)$.
- Low spin complex is diamagnetic or has low paramagnetism.
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