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The Jahn–Teller effect (JT effect or JTE) is an important mechanism of spontaneous symmetry breaking in molecular and solid-state systems which has far-reaching consequences in different fields, and is responsible for a variety of phenomena in spectroscopy, stereochemistry, crystal chemistry, molecular and solid-state physics, and materials science.
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.
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.
The pseudo Jahn–Teller effect (PJTE), occasionally also known as second-order JTE, is a direct extension of the Jahn–Teller effect (JTE) where spontaneous symmetry breaking in polyatomic systems (molecules and solids) occurs even when the relevant electronic states are not degenerate. The PJTE can occur under the influence of sufficiently ...
In this structure, the copper centers are octahedral. Most copper(II) compounds exhibit distortions from idealized octahedral geometry due to the Jahn-Teller effect , which in this case describes the localization of one d-electron into a molecular orbital that is strongly antibonding with respect to a pair of chloride ligands.
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.
President-elect Donald Trump lost a bid Monday to get his 34 felony convictions tossed out based on a Supreme Court ruling on presidential immunity, but he still has multiple avenues to fight the ...
Mercury(II) is a pseudo-Jahn-Teller-distorted octahedron. [27] The bis aqua structure of the mercury(I) ion, [(H 2 O)-Hg-Hg-(OH 2 )] + , found in solid compounds, [ 38 ] is not the same as that found in solution which involves three water molecules coordinated to each mercury completing a distorted tetrahedral arrangement. [ 27 ]