Isomerism & Crystal Field Theory Chapter 24 – Lecture 3

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Presentation transcript:

Isomerism & Crystal Field Theory Chapter 24 – Lecture 3 Chemistry 123 Spring 2008 Dr. Woodward

Isomers Different ligands make bonds to the metal Ligands bond to the metal through different atoms Ligands have different (ligand) neighbors Molecules are non-superimposable mirror images

Linkage Isomers

Geometric Isomers

Optical Isomers

Intra-atomic (d to d) excitations MnSO4 FeSO4 CoSO4 NiSO4 CuSO4 ZnSO4 In these complexes the color comes from absorption of light that leads to excitation of an electron from one d-orbital to a different d-orbital on the same metal cation.

[M(H2O)6]n+ Complex ions MO6 Octahedron H2O

Crystal Field Splitting (Octahedron) Energy dz2 & dx2-y2 orbitals (eg) Point directly at the ligands Stronger (repulsive) interaction with the ligands dz2 dx2-y2 dxy, dyz & dxz orbitals (t2g) Point between the ligands Weaker (repulsive) interaction with the ligands Figure: 24-30a-f dxy dyz dxz Electrons in d-orbitals are repelled from the electrons in the ligands. The repulsion is stronger for electrons in d-orbitals pointing directly at the ligands.

Energy Levels of d-orbitals in an octahedron dz2 D dx2-y2 dxy dyz dxz dz2 dx2-y2 Cr3+ ion with a spherical crystal field dxy dyz dxz dxy dyz dxz dz2 dx2-y2 Cr3+ ion in an octahedral crystal field Free Cr3+ ion

Electronic Excitation dx2-y2 dz2 Energy dx2-y2 dz2 eg light (photon) D = Crystal Field Splitting Energy t2g dxy dyz dxz Figure: 24-30a-f dxy dyz dxz

Antibonding (s*) Metal-Ligand MO’s Nonbonding Metal d MO’s [Cr3+(H2O)6]3+ Absorption Spectra Antibonding (s*) Metal-Ligand MO’s Doct Nonbonding Metal d MO’s