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(D) The Crystal Field Stabilization Energy $(CFSE)$ for an octahedral complex is given by $CFSE = (-0.4n_{t2g} + 0.6n_{eg})\Delta_o$. For $[Fe(phen)_3

Vedclass · Accepted Answer

$[Fe(phen)_3]^{2+}$

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(D) The Crystal Field Stabilization Energy $(CFSE)$ for an octahedral complex is given by $CFSE = (-0.4n_{t2g} + 0.6n_{eg})\Delta_o$. For $[Fe(phen)_3]^{2+}$,the central metal is $Fe^{2+}$ ($d^6$ configuration). Since $phen$ is a strong field ligand,it forms a low-spin complex with $t_{2g}^6 e_g^0$ configuration. $CFSE = (-0.4 	imes 6 + 0.6 	imes 0)\Delta_o = -2.4\Delta_o$. Upon oxidation to $Fe^{3+}$ ($d^5$ configuration),the complex becomes $[Fe(phen)_3]^{3+}$ with $t_{2g}^5 e_g^0$ configuration. $CFSE = (-0.4 	imes 5 + 0.6 	imes 0)\Delta_o = -2.0\Delta_o$. However,the question implies a significant loss or change in stability. Let's check $[Co(phen)_3]^{2+}$ $(d^7)$: $t_{2g}^6 e_g^1$ $(CFSE = -1.8\Delta_o)$. Oxidation to $Co^{3+}$ $(d^6)$: $t_{2g}^6 e_g^0$ $(CFSE = -2.4\Delta_o)$. Actually,for $Fe^{2+}$ $(d^6)$ to $Fe^{3+}$ $(d^5)$,the loss of an electron from the $t_{2g}$ orbital significantly reduces the stabilization energy. Thus,$[Fe(phen)_3]^{2+}$ is the correct answer.

List-$I$ (Electronic configuration of tetrahedral metal ion)	List-$II$ (Crystal Field Stabilization Energy $(\Delta_t)$)
$A$. $d^2$	$I$. $-0.6$
$B$. $d^4$	$II$. $-0.8$
$C$. $d^6$	$III$. $-1.2$
$D$. $d^8$	$IV$. $-0.4$

The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to $+3$ state is

Similar Questions

What is the relationship between the observed colour of a coordination complex and the wavelength of light absorbed by it?

Match the $LIST$-$I$ with $LIST$-$II$:

List-$I$ (Electronic configuration of tetrahedral metal ion) List-$II$ (Crystal Field Stabilization Energy $(\Delta_t)$)

$A$. $d^2$ $I$. $-0.6$

$B$. $d^4$ $II$. $-0.8$

$C$. $d^6$ $III$. $-1.2$

$D$. $d^8$ $IV$. $-0.4$

The order of energy absorbed,which is responsible for the color of the following complexes,is:

For a $d^{4}$ metal ion in an octahedral field,the correct electronic configuration is:

Which among the following complexes is associated with the maximum wavelength of light absorbed?

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