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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Apr 2008 19:22:34 IST
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30 Apr 2008 19:41:56 IST
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In explaing bonding in cordination compounds scientist used valance bond theory initially. But it was found that some ligands can force d electrons to pair up while others cannot. The reson of this behavior was not clear from vallence bond theory.
Crystal field theory is a better theory then vallence bond theory for explaining bonding in crdinations compound. It suggests that when ligands aproach d orbitals of central metal atom the degeneracy of d orbitals is lost as some orbitals face more repulsion compared to others. This leads to splitting of orbitals in two levels. If spliting energy is greater than pairing energy then ligand can force d electrons to pair up otherwise not.
While i am not sure of molecular orbital theory for bonding in cordination compounds (It is not in 12th syllabus) but it is based on quantum mechanics
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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