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  • What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

9.17     What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

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The arrangement of ligands in the increasing order of their crystal-field splitting energy (CFSE) values is known as spectrochemical series.

  \begin{aligned} & \mathrm{I}^{-}<\mathrm{Br}^{-}<\mathrm{SCN}^{-}<\mathrm{Cl}^{-}<\mathrm{S}^{2-}<\mathrm{F}^{-}<\mathrm{OH}^{-}<\mathrm{C}_2 \mathrm{O}_4{ }^{2-}<\mathrm{H}_2 \mathrm{O}<\mathrm{NCS}^{-} &<\text {edta }^{4-} \end{aligned}<\mathrm{NH}_3<\mathrm{en}<\mathrm{CN}^{-}<\mathrm{CO} .

The ligands on the right side of the series strong field ligands are present whereas on the left-hand side weak field ligands are present.

The strong field ligands are capable of splitting d orbitals to a higher extent as compared to weak field ligands.

Posted by

Devendra Khairwa

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