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  • Arrange the following Cobalt complexes in the order of incresing Crystal Field Stabilization Energy (CFSE) value. Complexes :   <img alt="\mathrm{\underset{\textbf{A}}{\left [ CoF_{6} \right ]^{3-}},\underset{\textbf{B}}{\left [ Co\left ( H_{

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

\mathrm{\underset{\textbf{A}}{\left [ CoF_{6} \right ]^{3-}},\underset{\textbf{B}}{\left [ Co\left ( H_{2}O \right )_{6} \right ]^{2+}},\underset{\textbf{C}}{\left [ Co\left ( NH_{3} \right )_{6} \right ]^{3+}}\: and\: \ \underset{\textbf{D}}{\left [ Co\left ( en \right )_{3} \right ]^{3+}}}

Choose the correct option :
Option: 1 \mathrm{B< C< D< A}
Option: 2 \mathrm{B< A< C< D}
Option: 3 \mathrm{A< B< C< D}
Option: 4 \mathrm{C< D< B< A}

Answers (1)

best_answer

As we have learnt ,

The CFSE depends upon the nature of ligands if the metal cation is the same.

Also, cations having greater positive charge have a greater CFSE.

Thus, the given complexes can be arranged in order of their CFSE as

\mathrm{\underset{\textbf{D}}{\left [ Co\left ( en \right )_{3} \right ]^{3+}}> \underset{\textbf{C}}{\left [ Co\left ( NH_{3} \right ) _{6} \right ]^{3+}}>\underset{\textbf{A}} {\left [ CoF_{6} \right ]^{3-}}> \underset{\textbf{B}}{\left [ Co\left ( H_{2}O \right )_{6} \right ]^{2+}}}

Hence, the correct answer is option (1)

Posted by

sudhir.kumar

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