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The Jahn–Teller effect is responsible for the tetragonal distortion of the hexaaquacopper(II) complex ion, [Cu(OH 2) 6] 2+, which might otherwise possess regular octahedral geometry. The two axial Cu−O distances are 238 pm , whereas the four equatorial Cu−O distances are ~195 pm.
The term can also refer to octahedral influenced by the Jahn–Teller effect, which is a common phenomenon encountered in coordination chemistry. This reduces the symmetry of the molecule from O h to D 4h and is known as a tetragonal distortion.
The prominent shoulder in this absorption band is due to a Jahn–Teller distortion which removes the degeneracy of the two 2 E g states. However, since these two transitions overlap in a UV-vis spectrum, this transition from 2 T 2g to 2 E g does not require a Tanabe–Sugano diagram.
Second-order Jahn-Teller distortion provides a rigorous and first-principles approach to the distortion problem. The interactions between the HOMOs and LUMOs to afford a new set of molecular orbitals is an example of second-order Jahn-Teller distortion.
In their early 1957 paper on what is now called pseudo Jahn–Teller effect (PJTE), Öpik and Pryce [2] showed that a small splitting of the degenerate electronic term does not necessarily remove the instability and distortion of a polyatomic system induced by the Jahn–Teller effect (JTE), provided that the splitting is sufficiently small (the two split states remain "pseudo degenerate ...
Most copper (II) complexes will exhibit the Jahn-Teller effect when the complex forms a tetragonal distortion of an octahedral complex geometry. [11] With blue copper proteins, a distorted tetrahedral complex will be formed due to the strong equatorial cysteine ligand and the weak axial methionine ligand. [ 11 ]
English: A conceptual comparison of the Jahn-Teller and pseudo Jahn-Teller effects, showing the mutual relation of two potential energy surfaces (PES) in the two cases. . The number of PES is two in this picture but it can be more in actual molecular or solid-state syst
Its distorted octahedral structure reflects geometric distortions due to the Jahn–Teller effect. The two most common structures for this complex include one with tetragonal elongation and one with tetragonal compression. For the elongation, two Mn–O bonds are 2.12 Å while the other four are 1.93 Å.