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MO diagram for MO diagram for: σ-donor ligand system, octahedral complex π-acceptor ligand system, octahedral complex

The document compares molecular orbital diagrams for octahedral complexes with σ-donor and π-acceptor ligands. For σ-donor ligands, ligand orbitals hybridize with metal d-orbitals to form bonding and antibonding molecular orbitals. For π-acceptor ligands, empty π-orbitals on the ligands hybridize with metal d-orbitals, lowering the energy of the t2g orbitals. The diagrams show how electrons from both the metal and ligand distribute across the molecular orbitals in each case.

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Lurthu Pushparaj
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550 views1 page

MO diagram for MO diagram for: σ-donor ligand system, octahedral complex π-acceptor ligand system, octahedral complex

The document compares molecular orbital diagrams for octahedral complexes with σ-donor and π-acceptor ligands. For σ-donor ligands, ligand orbitals hybridize with metal d-orbitals to form bonding and antibonding molecular orbitals. For π-acceptor ligands, empty π-orbitals on the ligands hybridize with metal d-orbitals, lowering the energy of the t2g orbitals. The diagrams show how electrons from both the metal and ligand distribute across the molecular orbitals in each case.

Uploaded by

Lurthu Pushparaj
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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MO diagram for σ-donor ligand system, octahedral complex MO diagram for π-acceptor ligand system, octahedral complex

a1g* a1g*

4p t1u* 4p t1u*

4s 4s
ligand
t2g* π*-orbitals

eg* eg*

3d 3d
t2g t2g

ligand ligand
σ-orbitals σ-orbitals
t2g

empty eg empty eg
partially filled partially filled
filled filled

t1u t1u

a1g a1g

Notes: – each ligand contributes an electron pair whether it is neutral or negatively charged.
– overlap between metal orbitals and ligand s-orbitals is in the order s > p > d.
– the six electron pairs derived from the ligands can be considered to fill the a1g, t1u and eg levels whilst the remaining
electrons derived from the metal are placed in the non-bonding t2g and antibonding eg* levels (of course, we cannot
distinguish between electrons derived from the ligand and those from the metal).

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