The Jahn-Teller effect is not observed in hig | vedclass

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Question

(B) The Jahn-Teller effect is a geometric distortion that occurs in non-linear molecules with unsymmetrical electronic configurations in the $e_g$ or

Vedclass · Accepted Answer

$d^8$

Vedclass · Answer

(B) The Jahn-Teller effect is a geometric distortion that occurs in non-linear molecules with unsymmetrical electronic configurations in the $e_g$ or $t_{2g}$ orbitals of octahedral complexes.For high spin complexes:- $d^4$ configuration is $t_{2g}^3 e_g^1$ (unsymmetrical).- $d^7$ configuration is $t_{2g}^5 e_g^2$ (unsymmetrical).- $d^9$ configuration is $t_{2g}^6 e_g^3$ (unsymmetrical).- $d^8$ configuration is $t_{2g}^6 e_g^2$ (symmetrical).Since the $d^8$ high spin complex has a symmetrical electronic configuration,it does not show Jahn-Teller distortion.

List-$I$ (Complex/ion)	List-$II$ (Shape/geometry)
$A$. $[Pt(Cl)_2(NH_3)_2]$	$I$. Octahedral
$B$. $[Co(NH_3)_6]Cl_3$	$II$. Trigonal bipyramidal
$C$. $[NiCl_4]^{2-}$	$III$. Square planar
$D$. $[Fe(CO)_5]$	$IV$. Tetrahedral

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

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Identify the number of unpaired electrons present and the geometry,respectively,of the complex $[CoF_6]^{3-}$ (given atomic number of $Co = 27$).

Match List-$I$ with List-$II$:
List-$I$ (Complex/ion) List-$II$ (Shape/geometry)
$A$. $[Pt(Cl)_2(NH_3)_2]$ $I$. Octahedral
$B$. $[Co(NH_3)_6]Cl_3$ $II$. Trigonal bipyramidal
$C$. $[NiCl_4]^{2-}$ $III$. Square planar
$D$. $[Fe(CO)_5]$ $IV$. Tetrahedral

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