The greatest body of data available about this effect concerns copper (II) compounds.
The greatest body of data available about this effect concerns copper (II) compounds. It is chiefly seen in high-spin d4, low-spin d7, and d9 configurations, in all of which the t sub 2g orbitals of octahedrally coordinated metal ions are all equally occupied, giving rise to a doubly degenerate ground state, and thus a distortion in the octahedron, often seen as an elongation along one of the four axes, with extreme cases causing a full distortion to a square planar complex. For 10 points -- name the effect in which a molecule in a degenerate state is unstable relative to a nondegenerate configuration of lower symmetry.
The greatest body of data available about this effect concerns copper (II) compounds.
(Landau-)Jahn-Teller effect