Скачать или смотреть Werners Theory of Coordination compounds

Postulates
Alfred Werner in 1898 proposed Werner’s theory explaining the structure of coordination compounds.
The central metal atom in the coordination compound exhibits two types of valency, namely, primary and secondary linkages or valencies.
Primary valencies are ionizable and are satisfied by the negative ions.
Secondary valencies are non-ionizable. These are satisfied by negative ions. Also, the secondary valence is fixed for any metal and is equal to its coordination number.
The ions bounded by the secondary linkages to the metal exhibit characteristic spatial arrangements corresponding to different coordination numbers.

Limitations
It fails to explain the magnetic, colour and optical properties shown by coordination compounds.
It failed to explain the reason why all elements don’t form coordination compounds.
It failed to explain the directional properties of bonds in coordination compounds.
This theory does not explain the stability of the complex
This theory could not explain the nature of complexes