Merits and demerits of crystal field theory

Presentation shortly discuss and summerise the merits and demerits of crystal field theory for undergraduates
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1. Merits and Demerits of Crystal Field Theory Dr. Mithil S. Fal Desai Assistant Professor in Chemistry SHREE MALLIKARJUN & Shri Chetan Manju Desai College Canacona Goa Concise Inorganic Chemistry, J. D. Lee, Chapman & Hall India, 4rth Edition, Year 1991 Inorganic Chemistry: Principle of structure and reactivity, J . E . Huheey , E. A . Keiter . R. L. Keiter , O. K. Medhi , Pearson Education India, 4rth Edition, Year 2006

2. Merits of Crystal Field Theory 2 Explains the split degeneracy of d-orbitals in a complex. T heory does explain the colour and spectra of complexes. Accounts for magnetic property of the complexes. Explains the stability of particular oxidation state in aqueous solutions.

3. Demerits of Crystal Field Theory Interaction of metal ligand is considered purely electrostatic. Only electrons from d orbital of the metal ion are considered (other orbitals such as s and p are not taken into consideration) and no significance to the orbits of the ligands. C omplexes in which metal oxidation state is zero and ligand is neutral does not explain the electrostatic attraction between the metal and the ligands. Eg . [Cr(C 6 H 6 ) 2 ] Does not explain the relative strength of ligands in spectrochemical series. (Why H 2 O is strong field ligand than OH - ) Does not consider any π bonding (double bond and triple bond) in complexes.