The john teller distortion, also known as the jahn-teller effect, is a nonlinear geometrical distortion of a molecule that lowers its symmetry and energy. This is most common in octahedral complexes, where the axial bonds can be shorter or longer than the equatorial ones. The jahn-teller effect also known as john teller distortion is used to describe the geometrical distortions of molecules or ions that are associated with electronic configurations. The complexes with high spin such as d3,d5,d8,&d10 do not exhibit the effect of jahn-teller distortions. These configurations correspond to a variety of transition metals.
Most common examples are as follows; Cr3+,Co3+,&Ni2+ .