Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value. Complexes: CoF 6 3 - A , Co H 2 O 6 2 + B , Co NH 3 6 3 + C and Co ( en ) 3 3 + D Cho

Question

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.

Complexes: $\begin{matrix} \underset{A}{{[{CoF}_{6}]}^{3 -}}, & \underset{B}{{[Co {(H_{2} O)}_{6}]}^{2 +}}, & \underset{C}{{[Co {({NH}_{3})}_{6}]}^{3 +}} and \underset{D}{{[Co (en)_{3}]}^{3 +}} \end{matrix}$

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TestHub · Accepted Answer

CFSE ∝ Strength of ligand en > NH 3 > H 2 O > F - CFSE ∝ Oxidation number of the central metal. ∴ Order of CFSE Co H 2 O 6 2 + < CoF 6 3 - < Co NH 3 6 3 + < Co ( en ) 3 3 +

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