Question

Select incorrect match for $\left[M\right(H_{2}O{)}_6{]}^{2+}$ complex

• A. Metal ions - $M{n}^{2+}$ Electronic configuration - $t_{2g}^3{e}_g^2$ CFSE - $0{\Delta }_0$
• B. Metal ions- $V^{2+}$ Electronic configuration - $t_{2g}^3{e}_g^0$ CFSE - $-1.2{\Delta }_0$
• C. Metal ions- $N{i}^{2+}$ Electronic configuration - $t_{2g}^6{e}_g^2$ CFSE - $-1.6{\Delta }_0$
• D. Metal ions- $T{i}^{2+}$ Electronic configuration - $t_{2g}^2{e}_g^0$ CFSE - $-1.8{\Delta }_0$

Answer 1

The correct option is C Metal ions- $N{i}^{2+}$ Electronic configuration - $t_{2g}^6{e}_g^2$ CFSE - $-1.6{\Delta }_0$

$CFSE=-0.4{\Delta }_{0}n{t}_{2}g+0.6{\Delta }_{0}neg$
Where n = no. of electrons
Thus, $\left[Ni\right(H_{2}O{)}_6{]}^{2+}$ has $CFSE=-1.2{\Delta }_0$