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Linkage isomerism is the existence of coordination compounds that have the same composition differing with the connectivity of the metal to a ligand.
Typical ligands that give rise to linkage isomers are:
Examples of linkage isomers are violet-colored 5Co-SCN] and orange-colored 5Co-NCS]. The isomerization of the S-bonded isomer to the N-bonded isomer occurs intramolecularly.
The complex cis-dichlorotetrakisruthenium 4] exhibits linkage isomerism of dimethyl sulfoxide ligands due to S- vs. O-bonding. Trans-dichlorotetrakisruthenium does not exhibit linkage isomers.
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