History
Ligand field theory was developed during the 1930s and 1940s as an alternative to crystal field theory (CFT). CFT describes certain properties of coordination complexes but is based on a model that emphasizes electrostatic interactions between ligand electrons with the d-electrons on the metal. CFT does not describe bonding. Ligand Field Theory, in a sense, combined CFT and the then-emerging molecular orbital theory.
Read more about this topic: Ligand Field Theory
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