Question

Crystal field stabilisation energy for high spin d⁴ octahedral complex is:

(a) -0.6 Δ_o
(b) -1.8 Δ_o
(c) -1.66 Δ_o + P
(d) -1.2 Δ_o

Answer 1

Correct option is (a) -0.6 Δ_o

d⁴ octahedral complex has the configuration t_2g³ e_g¹

CFSE = (-0.4x + 0.6y) Δ_o

x = no. of electron in t_2g

y = no. of electron in e_g

CFSE = [-0.4 x 3+ 0.6 x 1] Δ_o

= [-1.2 + 0.6] Δ_o

= – 0.6 Δ_o