Ligand Field Theory (LFT) in conjunction with the Molecular Orbital Theory (MOT)

Question

Ligand Field Theory (LFT) in conjunction with the Molecular Orbital Theory (MOT):

t2g in LFT corresponds to                                                                                  

eg in LFT corresponds to

t2gbonding in MOT

t2gnonbonding in MOT

t2gantibonding in MOT

egbonding in MOT

egnonbonding in MOT

egantibonding in MOT

-

t2g in LFT corresponds to                                                                                  

-

eg in LFT corresponds to

A.

t2gbonding in MOT

B.

t2gnonbonding in MOT

C.

t2gantibonding in MOT

D.

egbonding in MOT

E.

egnonbonding in MOT

F.

egantibonding in MOT

Explanation / Answer

t2g in LFT corresponds to - t2g nonbonding in MOT (option B)

eg in LFT corresponds to - eg antibonding in MOT (option F)

In the case of octahedral complexes, when we examine its MO diagram we find that the electrons initially present in the d-orbitals of the metal will enter into t2 nonbonding and eg antibonding (eg*) molecular orbitals and the difference in energy between the t2g nonbonding and eg* orbitals corresponds to ligand field stabilisation energy (LFSE).

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