Jahn-Teller effect is not observed in high spin complexes of

Jahn-Teller distortion is usually significant for asymmetrically occupied eg orbitals since they are directed towards the ligands and the energy gain is considerably more. In case of unevenly occupied t2gorbitals, the Jahn-Teller distortion is very weak since the t2g set does not point directly at the ligands and therefore, the energy gain is much less. High spin complexes