Find the number of paramagnetic species each central metal ion having t_{2 g}^{6} \textrm{ }\textrm{ } eg ° configuration. (i) K4[Fe(CN)6] (iii) K4[Fe(CN)5O2] (iv) K3[Co(CN)5O2] (v) [Fe(CN)5O2]–5 (vi) Na2[Fe(CN)5NO+] (vii) K4[Co(CN)5O2]

Engineering

Chemistry

Isomerism in Coordination Compounds

Question

Find the number of paramagnetic species each central metal ion having $t_{2 g}^{6} eg °$ configuration.
(i) K₄[Fe(CN)₆]

(iii) K₄[Fe(CN)₅O₂]

(iv) K₃[Co(CN)₅O₂]

(v) [Fe(CN)₅O₂]^–5

(vi) Na₂[Fe(CN)₅NO⁺]

(vii) K₄[Co(CN)₅O₂]

If the central metal ion having $t_{2 g}^{6} eg °$ configuration than Fe and Co show +2 and +3 oxidation state respectively.
In the presence of O₂^– , complex show paramagentic behavieour
(i) K₄[Fe(CN)₆] $\overset{}{\to}$    diamagnetic

(iii) K₄[Fe⁺²(CN)₅O₂^–1] $\overset{}{\to}$    paramagentic
(iv) K₃[Co⁺³(CN)₅O₂^–1] $\overset{}{\to}$    paramagentic
(v) [Fe⁺²(CN)₅O₂^–2]^–5         $\overset{}{\to}$    diamagnetic
(vi) Na₂[Fe⁺²(CN)₅NO⁺] $\overset{}{\to}$    diamagnetic
(vii) K₄[Co⁺³(CN)₅O₂^–2]    $\overset{}{\to}$    diamagnetic

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