Order of Energy in Octahedral

Order of energy in octahedral:-

dx² – y² = dz² > dxy = dyz = dzx

d₁, d₂, d₃ do not care that whether the legand is weak or strong.

Weak Legand					Strong Legand
High spin energy					Low spin Energy
d-orbital	t2g	eg	Spin multiplicity	CFSE	t2g	eg	Spin multiplicity	CFSE
d₁	1	0	+1/2	-0.4 Δ_o	1	0	+1/2	-0.4
d₂	2	0	+1	-4.08Δ_o	2	0	+1	-0.8
d₃	3	0	+3/2	-1.2Δ_o	3	0	+3/2	-1.2
d₄	3	1	+2	-0.6Δ_o	4	0	+1	-1.6
d₅	3	2	+5/2	Zero	5	0	+1/2	-2.0
d₆	4	2	+2	-0.4Δ_o	6	0	Zero	-2.4 (max. value most stable)
d₇	5	2	+3/2	-0.8Δ_o	6	1	+1/2	-1.8
d₈	6	2	+1	-1.2	6	2	+1	-1.2
d₉	6	3	+1/2	-0.6	6	3	+1/2	-0.6
d₁₀	6	4	Zero	Zero	6	4	Zero	Zero

d²sp³, diamagnetic, inner, low spin

μ = 0 Configuration = t2⁶g eg⁰

Configuration is written for metal only not for the legand as bond is Ionic not covalent.

Fe = +2 (Oxidation state)

[FeCl₆]^-4 ==>Sp³d² , pare, high spin

Configuration:-

t2g⁴ eg²

C.F.S.E ==> -0.4 Δ_o + P

âˆ†O = (-4x + 6y) Dq

[Fe (CN)₆ ]^-3 d²Sp³, para, inner, low spin.
Cr (NH₃)₆ ]⁺³ Cr + 3 = 3d³

d²sp³, Para,

t2g³ eg⁰

CFSE = -1.2 Δ_o

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12 PMT Chemistry Coordination Compounds Order of Energy in Octahedral