First slide

Crystal field theory

Question

Which of the following complex will have the least value of CFSE(ignore the contribution of pairing energy)

Easy

A

${[Fe {(H_{2} O)}_{6}]}^{+ 2}$
B

${[Fe {(CN)}_{6}]}^{- 4}$
C

${[Fe {(CN)}_{6}]}^{- 3}$
D

${[Fe {(H_{2} O)}_{6}]}^{+ 3}$

Solution

$1) d^{6} - t_{2 g}^{4} e_{g}^{2}; W . F . L . . . ∆_{0} < P CFSE = 4 (- 0.4 ∆_{0}) + 2 (0.6 ∆_{0}) = - 0.4 ∆_{0}; 2) S . F . L . . . ∆_{o} > P; d^{6} - t_{2 g}^{6}; CFSE = 6 (- 0.4 ∆_{0}) = - 2.4 ∆_{0}; 3) S . F . L . . . ∆_{o} > P; d^{5} - t_{2 g}^{5}; CFSE = 5 (- 0.4 ∆_{0}) = - 2.0 ∆_{0}; 4) d^{5} - t_{2 g}^{3} e_{g}^{2}; W . F . L . . . ∆_{0} < P CFSE = 3 (- 0.4 ∆_{0}) + 2 (0.6 ∆_{0}) = Zero;$

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