Stereoisomerism of Complex Ions
Chemistry: Cambridge International A Level, topic 2.4.7
Isomerism of Complex Ions
Complex ions display several kinds of isomerism.
Cis/trans isomers
- Cis/trans isomerism is a bit like E/Z isomerism.
- When two groups are on the same side, they are cis.
- When two groups are on opposite sides, they are trans.
Cis/trans isomers
- An example is the complex [Ni(H2O)4)Cl2].
- The chlorine and water groups can either be on the same or different sides, as shown.
- Cis/trans isomerism is also very common in square planar structures.
Optical isomerism
- Octahedral molecules with three bidentate ligands exist as pairs of enantiomers.
- This is illustrated for a nickel complex above. image: Ni(en)3 isomers.
Test yourself on Stereoisomerism of Complex Ions
An octahedral complex containing three bidentate ligands can exist as pairs of what?
What type of isomerism does [Ni(H2O)4)Cl2] show?