Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Ionization isomers are coordination compounds that have the same composition but yield different ions in solution. This occurs due to the interchange of ligands between the inner coordination sphere and the counter-ions.
5 Must Know Facts For Your Next Test
Ionization isomers differ in which ions are produced when they dissolve in water.
These isomers have identical empirical formulas but different chemical behaviors in solutions.
Ionization isomers can be identified by differences in conductivity, precipitation reactions, or ion-exchange chromatography.
The concept of ionization isomerism highlights the versatility and complexity of coordination compounds.
Examples include [Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br, which produce different ions upon dissolution.
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Related terms
Coordination Compound: A compound consisting typically of a central metal atom bonded to surrounding molecules or anions called ligands.
An ion or molecule attached to a central metal atom by coordinate bonding.
Geometrical Isomerism: A form of stereoisomerism where compounds have the same type and number of atoms and bonds but differ in their spatial arrangement.