cation, the energies of the valence d orbitals on the cobalt atom are split acco

Question

cation, the energies of the valence d orbitals on the cobalt atom are split according When a certain strong-field ligand forms an octahedral complex with Co to this electron box diagram: energy in kJ/mol 350 -400 450 500 550 xy yzx2 700 Using this diagram, answer the following questions. How many unpaired d electron spins does the cobalt atom have? paramagnetic diamagnetic blue or green red or violet O orange or yellow Is the complex paramagnetic or diamagnetic? Predict the color of the complex. white or transparent

Explanation / Answer

Co2+ (Z=27) Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d7

1.

In strong field ligand, electrons are filled in d - orbitals against to Hund's rule. SO,

After splitting, in strong field ligand,

Co2+ d - orbital configurations,

dxy2 dyz2 dzx2 dx2-y21

1. So, number of unpaired electrons = 1

2. SInce there unpaired electron, it is para magnetic .

3. Since it strong field complex, there is large difference between t2g and eg orbitals. Hence it absorbs high energy radiations. Hence while emitting it gives complementory low enegy ( high wave length ) radiation.

So, color of Co2+ complex in strong field ligand is Orange or Yellow

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