lecture 12 - a1g 4pz px t1u 4s a1g ( ) dyz dz2 py * ( )...

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4s p x p y 4p z a 1g t 1u d yz d xy 3d xz d z2 d x2–y2 e g t 2g M +n LGO(1) LGO(2)–LGO(4) LGO(5) LGO(6) a 1g t 1u e g L (nonbonding) d xy t 2g d yz d xz HOMO-LUMO region t 1u ( σ ) e g ( σ ) e g * d z2 d x2–y2 ( σ ) a 1g * ( σ ) σ–bonding only
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π –bonding influences the magnitude of the d–orbital splitting O O π –interaction with some ligands causes this splitting to increase π π –acceptors –acceptors (NO, CO, CN –) d z2 d x2–y2 e g * t 2g (nonbonding) (nonbonding) d yz d xy d xz ( σ ) O σ–bonding only d z2 d x2–y2 ( σ ) e g * d xy d xz d yz t 2g ( π )
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4s p x p y 4p z a 1g t 1u d yz d xy 3d xz d z2 d x2–y2 e g t 2g M +n LGO(1) LGO(2)–LGO(4) LGO(5) LGO(6) a 1g t 1u e g L (nonbonding) d xy t 2g d yz d xz HOMO-LUMO region t 1u ( σ ) e g ( σ ) e g * d z2 d x2–y2 ( σ ) a 1g * ( σ ) σ–bonding only
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4s p x p y 4p z a 1g t 1u d yz d xy 3d xz d z2 d x2–y2 e g t 2g M +n LGO(1) LGO(2)–LGO(4) LGO(5) LGO(6) a 1g t 1u e g L d xy t 2g d yz d xz HOMO-LUMO region t 1u ( σ ) e g ( σ ) e g * d z2 d x2–y2 ( σ ) a 1g * ( σ ) π–bonding with a π-acceptor ligand
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6 O h Symmetry Adapted Orbitals 6 π–symmetry orbitals
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d yz another LGO with t 2g symmetry M L L L L x y z π –bonding interactions occur with the metal’s t 2g orbitals the d–orbital shown above only interacts with ligands that lie along the y– and z–axes
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d xy a third LGO with t 2g symmetry M L L L L π –bonding interactions occur with the metal’s t 2g orbitals the d–orbital shown above only interacts with ligands that lie along the y– and x–axes x y z
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π –bonding influences the magnitude of the d–orbital splitting O Cl , SR , I , Br d z2 d x2–y2 e g * t 2g (nonbonding) (nonbonding) d yz d xy d xz ( σ ) O σ–bonding only O π –interaction with some ligands causes this splitting to decrease π π –donors –donors d z2 d x2–y2 ( σ ) e g * d xy d xz d yz t 2g ( π )
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4s p x p y 4p z a 1g t 1u d yz d xy 3d xz d z2 d x2–y2 e g t 2g M +n LGO(1) LGO(2)–LGO(4) LGO(5) LGO(6) a 1g t 1u e g L (nonbonding) d xy t 2g d yz d xz HOMO-LUMO region t 1u ( σ ) e g ( σ ) e g * d z2 d x2–y2 ( σ ) a 1g * ( σ ) σ–bonding only
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p x p y 4p z a 1g t 1u d yz d xy 3d xz d z2 d x2–y2 e g t 2g M +n LGO(1) LGO(2)–LGO(4)
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lecture 12 - a1g 4pz px t1u 4s a1g ( ) dyz dz2 py * ( )...

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