give reason why VBT not able to explain nature of bonding in metal complex and how CFT removes defects of VBT
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Postulates of Valence Bond Theory
Covalent bonds are formed when two valence orbitals (half-filled) belonging to two different atoms overlap on each other. ... Covalent chemical bonds are directional and are also parallel to the region corresponding to the atomic orbitals that are overlapping.
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Reasons why Valence Bond Theory is not able to explain bonding in metal complexes are as follows:
- VBT considers bond formation between atoms only when two valence orbitals (half filled) come together , but in complexes , coordinate bonds form due to donation of 2 electrons to a single empty orbital of the metal.
- Other issues that can't be explained were stabilisation of enegies , colour of complexes,etc.
Limitations removed by CFT:
- CFT is an electrostatic model considering the metal-electron donating complex to be purely ionic.
- In presence of any electron donating species, there is degeneracy of the d orbitals , such that electron stability is maintained.
- CFT can quantitatively describe the energy of a coordinate bond in a complex , and hence solve the limitations.
Hope It Helps.
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