Flashcards in The Jahn- Teller Theorem Deck (6)
What is the Jahn Teller effect?
It is a distortion to remove degeneracy by making an orbital lower in energy and stabilising the complex
When does the Jahn Teller effect occur?
It occurs when there is a degenerate group state or when electrons are unequally distributed among orbitals of the same energy
UNEVEN DISTRIBUTION IF E-
Also when there are two options for filling the orbitals and both have the same energy (degenerate)
What distortion can occur with a regular octahedron?
Two of the 6 bond will be longer and weaker
For which complexes is the Jahn Teller effect particular important?
Important for d4 and d9 as these involve the uneven occupation of the eg orbitals
This effect is larger because the dx2-y2 and dz2 orbitals point directly at the ligands
Why is the Jahn Teller effect small for t2g orbitals
The effect is small as these orbitals point towards the ligands