text: In chemistry, linkage isomerism or ambidentate isomerism is a form of isomerism in which certain coordination compounds have the same composition but differ in their metal atom's connectivity to a ligand.
  Typical ligands that give rise to linkage isomers are:
  *cyanide,  – isocyanide, 
  *cyanate,  – isocyanate, 
  *thiocyanate,  – isothiocyanate, 
  *selenocyanate,  – isoselenocyanate, 
  *nitrite, 
  *sulfite, 
  Examples of linkage isomers are violet-colored  and orange-colored . The isomerization of the S-bonded isomer to the N-bonded isomer occurs intramolecularly.
  The complex cis-dichlorotetrakis(dimethylsulfoxide)ruthenium(II) () exhibits linkage isomerism of dimethyl sulfoxide ligands due to S- vs. O-bonding. Trans-dichlorotetrakis(dimethylsulfoxide)ruthenium(II) does not exhibit linkage isomers.