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  4. Octahedral complexes of copper (II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II) complexes will show the maximum structural distortion ? (en-ethylenediamine; H 2 N - CH 2- CH 2- NH 2 )

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Q. Octahedral complexes of copper (II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II) complexes will show the maximum structural distortion ? (en-ethylenediamine; $H _2 N - CH _2- CH _2- NH _2$ )

JEE MainJEE Main 2022Coordination Compounds

Solution:

There is unsymmetric filling of $e_g$ subset of $Cu ^{+2}$ ion, while there is symmetrical distribution in $t _{2 g}$ set, if the complex has same ligand there will be equal repulsion which leads to symmetrical bond length along $t _{2 g}$, but due to uneven filling of electron in $e_{ g }$ subset, either octahedral will be elongated or compressed.