Jahn Teller effect (JTE) explains the axial distortion in perfect octahedral geometry. It is present in ${\mathrm{d}}^4$ high spin, ${\mathrm{d}}^7$ low spin and ${\mathrm{d}}^9$ configuration, which have an odd number of electrons in a ${\mathrm{e}}_{\mathrm{g}}$ set. A weak Jahn Teller effect is also present in ${\mathrm{d}}^7$ high spin complex, which has an odd number of electrons in the set. Therefore, the Jahn Teller effect is not observed in high spin complexes of ${\mathrm{d}}^8$ orbital.