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Question
Write postulates of Werner theory of co-ordination complexes.
Solution
- In coordination compounds, metal ions show two types of valencies:
- Primary (ionizable) valency and
- secondary (nonionizable) valency
- The ionizable sphere consists of entities that satisfy the primary valency of the metal. Primary valencies are generally satisfied by anions.
- The secondary valencies are non-ionizable and are satisfied by neutral molecules or negative ions. Every metal atom has a fixed secondary valency or coordination number.
- The ions/groups attached to secondary valencies with the metal have characteristic spatial arrangement, i.e., are directed towards a fixed position in space, which leads to the defined geometry of coordination compounds.
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