The stability of the coordination compound depends on
Nature of the ligand:
Chelating ligands form strong and more stable complexes than the monodentate ligands. The π- bond ligands forms more stable complexes than the σ- bonded complex.
Nature of the metal atom/ion:
Small, highly charged metal ions form more stable complexes than large size, lowly charged metal ion.
Color in Coordination Compounds
- The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron, i.e., the transiton of electron from t2g level to the higher eg level which accompanies the absorption of light in visible spectrum.
- In the absence of ligands, crystal field splitting does not occur and hence the substance is colourless.
Limitations of crystal field theory
- It does not take into account the partly covalent character of bonding between the ligand and the central atom.
- It is also unable to explain the relative strengths of ligands e.g., it does not explain why H2O is stronger ligand than OH−.
We are sorry that this post was not useful for you!
Let us improve this post!
Tell us how we can improve this post? Please mention your Email so that we can contact you for better feedback.