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  Octahedral complexes

Octahedral complexes:

1) Fe atom:

Outer electronic configuration 3d64s2

2419_octahedral complex.jpg

Number of unpaired electron = 4

∴ µs = √4(4+2) = 4.90 BM

The molecule is paramagnetic and geometry of the molecule is octahedral.

2) Fe+2 ion:

1193_octahedral complex2.jpg

In [Fe(CN)6]4- complex the CN- ligand is an influential ligand, it forces the unpaired electrons in 3d level to pair up within. Therefore the species contain no unpaired electron. The molecule is diamagnetic.

1922_octahedral complex3.jpg

And the molecular geometry is octahedral.


Defects of Valence bond theory:

However VB theory was the principal manner in which chemist visualized coordination compounds until the year 1950s, it has fallen into disfavor due to its incapability to account for different magnetic, electronic and spectroscopic properties of such compounds.

 

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