-0, THE TRANSITION METALS Predicting color and magnetic properties from a crysta

Question

-0, THE TRANSITION METALS Predicting color and magnetic properties from a crystal field theo... When a certain weak-field ligand forms a tetrahedral complex with Mn cation, the energies of the valence d orbitals on the manganese atom are split according to this electron box diagram energy in kJ/mol -200 -300- xyyx2 -400 -500 --- 2 X-y -600 Using this diagram, answer the following questions. How many unpaired d electron spins does the manganese atom C0 have? O paramagnetic Is the complex paramagnetic or diamagnetic? diamagnetic

Explanation / Answer

(i) The valence electronic configuration of Mn = 3d54s2

Now, certain weak-field ligand forms a tetrahedral complex with Mn3+ cation, i.e. d4 system.

The electronic configuration of Mn3+ in the complex = dz21dx2-y21dxy1dyz1

Therefore, manganese atom in the complex has four unpaired d electron spins.

(ii) The complex is paramagnetic due to the presence of unpaired electrons.

(iii) The color of the complex may be blue or green.

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