Answer :

Hybridization of [CoF6]3-


Co3+ is the central atom with a fluoride ligand being the donor.


Electronic configuration = 2, 8, 7


= 4s2, 3d7


Oxidised state = 4s0, 3d6





Orbital of Co3+






Since (F) is a weak field ligand according to the spectrochemical series of ligands it acquires higher energy orbitals and thus results in no spin pairing of electrons in the lower d orbital and acquires one empty s orbital, three p orbitals and two empty d orbitals of higher energy, to give sp3d2 hybridization.






Orbital of Co3+ undergoing hybridization






The given structure shows sp3d2 hybridization, and as the compound has 3 unpaired electrons it is paramagnetic.


Due to acquiring of higher energy orbitals the stability of the compound decreases significantly.


Also the outer d-orbitals are used for bonding thus the compound is outer complex and is a high spin complex.


Hybridization of [CoF6]3-


Co3+ is the central atom with a fluoride ligand being the donor.


Electronic configuration = 2, 8, 7


= 4s2, 3d7



Oxidised state = 4s0, 3d6






Orbital of Co3+






Since (en) is a strong field ligand according to the spectrochemical series of ligands it acquires lower energy orbitals and thus results in spin pairing of electrons in the lower d orbital and acquires one empty s orbital, three p orbitals and two empty d orbitals of lower energy, to give d2sp3d2 hybridization.










Orbital of Co3+ undergoing hybridization




d2sp3 hybirdization






The given structure shows d2sp3 hybridization, and as the compound has 0 unpaired electrons it is diamagnetic.


Due to acquiring of lower energy orbitals the stability of the compound increases significantly.


Also the inner d-orbitals are used for bonding thus the compound is inner complex and is also a low spin complex.



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