Class 12 Chemistry - Chapter Coordination Compounds NCERT Solutions | Explain the bonding in coordination comp
Explain the bonding in coordination compounds in terms of Werner’s postulates.
In order to explain the nature of bonding and structure of coordination compounds, Werner in 1893 proposed a theory called as Werner’s Coordination Theory. The postulates of theory are as follows:
1. In coordination compounds, metal atoms exhibit 2 types of valencies namely, primary and secondary valency. The primary valency is ionizable whereas the secondary valency is non- ionizable, i.e. primary valency corresponds to oxidation state and secondary valency corresponds to coordination number.
2. Every metal atom has a fixed number of secondary valencies i.e. fixed coordination number.
3. The metal atom tends to satisfy both its primary as well as secondary valencies. Primary valencies are satisfied by negative ions whereas secondary valencies are satisfied by negative or by neutral molecules.
4. The secondary valencies are always directed towards the fixed positions in space and this leads to definite geometry of the coordination compound. For example: if the metal ion has four secondary valencies, these are arranged in either tetrahedral or square planar arrangement around the central metal ion. The secondary valencies, thus, determine the stereochemistry of the complex.
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[NiCl4]2- is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral. Why?
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Write the formulas for the following coordination compounds:
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(ii) Potassium tetracyanonickelate(II)
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