Structural isomerism involves compounds with the same chemical formulae, but have different chemical bonds in the molecules. It can further be divided into:
Linkage Isomerism, which arises generally in ambidentate ligand containing coordination compounds.
Coordination isomerism, which arises due to the interchange (between the cationic and the anionic parts of the metal ions) of ligands.
Ionization Isomerism, which arises when counter ions can act as potential ligands in complex salts.
Solvate isomerism, which arises when water is used as a solvent. It is also known as hydrate isomerism.