Significance of crystal field theory
This theory is useful to explain the following properties of complexes.
a) High spin states and low spin states-
Strong field ligand → high CFSE value → low spin complexes
Weal field ligand → low CFSE value → high spin complexes
b) Magnetic properties-
c) Colour-
d) Geometry of complexes
Limitations of crystal field theory
It was successful to
explain the colour, magnetic properties, the effects of weak and strong field
ligands etc in the coordination compound. However, it has the following
limitations-
·
As ligands are
considered as a points charges, the anionic ligands should exert greater
splitting effect however, actually the anionic ligands are present at low end
of the effect of spectrochemical series
·
It treats the
metal-ligand bond as purely ionic and does not take into account the covalent
character of the bond.
These weaknesses have been explained by ligand
field theory and Molecular orbital theory which are out of the CBSE syllabus of
class 12.
Thank you sir. Now my doubt is clear.^↓^
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