Coordination Compounds

The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is

  1. d5 (in strong ligand field)
  2. d3 (in weak as well as in strong fields)
  3. d4 (in weak ligand field)
  4. d4 (in strong ligand field)


Spin only magnetic moment = √(n(n+2)) B.M.

Where n = number of unpaired electron

Given, √(n(n+2)) = 2.84

n(n + 2) = 8.0656

n = 2

In an octahedral complex, for a d4 configuration in a strong field ligand, number of unpaired electrons = 2

The correct option is D.