Coordination Compounds – Solutions
1) Explain the bonding in coordination compounds in terms of Werner’s postulates.
There are two types of valencies shown by central metal ion in a corrdination compound: i) Primary valency ii) Secondary valency
- Primary valency corresponds to oxidation number and secondary valency corresponds to corrdination number.
- In the complex [Co(NH3)]Cl3 , primary valency of Co is three and secondary valency is six.
- Primary valency is satisfied by negative ions(anions) while secondary valency is satisfied by ligands which can be neutral and as well as negative (positive in rare case).
In [Co(III) (NH3)6 ]Cl3. six NH3 ligands satisfy secondary valencies while three Cl-ions satisfy primary valencies.