Coordination Compounds Class 12 Notes - Chapter 9

Coordination compounds is a challenging area in modern inorganic chemistry. Due to the advancement in this area new concepts such as models of bonding, molecular structure, important insights on the functioning of complex components of the biological system, etc. have been developed.

A.Werner was the first to attempt to explain the reaction, formation, structure, bonding of coordination compound. The theory given by him postulates two different types of linkages by metal ion or atom in the coordination compound. They are primary linkages and secondary linkages. In modern chemistry language, these bonds are recognized as ionic bond(ionizable) and covalent (non-ionisable) bond respectively. With the help of isomerism, he predicted the geometrical shape of a majority of coordinate entities.

Valence Bond Theory Coordination Compounds

This theory explains the formation, geometrical shape, and magnetic behavior of coordination compounds. However, valence bond theory (VBT) fails to give the quantitative interpretation of magnetic behaviour and also has nothing to say anything about the optical properties of these compounds.

Few Important Questions

  1. Explain the difference between unidentate, didentate, ambidentate ligands with two examples each.
  2. What does stability of a coordination compound in solution mean? What are the factors that govern stability complexes?
  3. Explain Werner’s postulates for the bonding in coordination compounds.
  4. What are the different types of isomerism possible for coordination compounds? Give example for each.
  5. Explain the chelate effect with an example.
  6. What is coordination entity? Give one example
  7. How many geometrical isomers are possible for Co(NH3)3Cl3

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Einstein's photoelectric equation states that Ek=hvϕ. In this equation Ek  refers to