are reversed. Some more examples for coordination isomers . [Cr(NH ) CN][Co(NH )(CN) ] and [Co(NH ) CN][Cr(NH )(CN) ] . [Pt(NH ) ][Pd(Cl) ] and [Pd(NH ) ][Pt(Cl) ] Ionisation isomers: This type of isomers arises when an ionisable counter ion (simple ion) itself can act as a ligand.
The exchange of such counter ions with one or more ligands in the coordination entity will result in ionisation isomers. These isomers will give different ions in solution. For example, consider the coordination compound [Pt(en) Cl ]Br . In this compound, both Br - and Cl - have the ability to act as a ligand and the exchange of these two ions result in a different isomer [Pt(en) Br ]Cl .
In solution the first compound gives Br - ions while the later gives Cl - ions and hence these compounds are called ionisation isomers. Some more example for the isomers, . [Cr(NH ) ClBr]NO and [Cr(NH ) Cl NO ]Br . [Co(NH ) Br ]Cl and [Co(NH ) Cl Br]Br XII U5 Coordination XII U5 Coordination - - - - Evaluate yourself : A solution of [Co(NH ) l ]Cl when treated with AgNO gives a white precipitate.
What should be the formula of isomer of the dissolved complex that gives yellow precipitate with AgNO . What are the above isomers called? Solvate isomers. The exchange of free solvent molecules such as water , ammonia, alcohol etc..
in the crystal lattice with a ligand in the coordination entity will give different isomers. These type of isomers are called solvate isomers. If the solvent molecule is water, then these isomers are called hydrate isomers. For example, the complex with chemical formula CrCl .6H O has three hydrate isomers as shown below.
[Cr(H O) ]Cl a violet colour compound and gives three chloride ions in solution,