28 - Chemistry 1000 Lecture 28: Crystal field theory Marc...

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Unformatted text preview: Chemistry 1000 Lecture 28: Crystal field theory Marc R. Roussel The d orbitals-20-10-20-20-10-10 10 10 20 20 10 y z 20 x-20-10-24-20-20-16-12-10-8-4 4 8 10 12 16 20 20 24 10 y z 20 x 3d x 2- y 2 3d z 2-20-10-20-20-10-10 10 10 20 20 10 y z 20 x-20-10-20-20-10-10 10 10 20 20 10 y z 20 x-20-10-20-20-10-10 10 10 20 20 10 y z 20 x 3d xy 3d xz 3d yz Crystal field theory I In an isolated atom or ion, the d orbitals are all degenerate, i.e. they have identical orbital energies. I When we add ligands however, the spherical symmetry of the atom is broken, and the d orbitals end up having different energies. I The qualitative appearance of the energy level diagram depends on the structure of the complex (octahedral vs square planar vs. . .). I The relative size of the energy level separation depends on the ligand, i.e. some ligands reproducibly create larger separations than others. Octahedral crystal fields I In an octahedral complex, the d x 2- y 2 and d z 2 orbitals point directly at some of the ligands while the d...
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This note was uploaded on 03/03/2012 for the course CHEM 1000 taught by Professor Marc during the Fall '06 term at Lethbridge College.

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28 - Chemistry 1000 Lecture 28: Crystal field theory Marc...

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