Describe the differences between the thermodynamic stability of complexes with different types of ligands.

The thermodynamic stability of complexes varies with different types of ligands.

The thermodynamic stability of a complex is determined by the strength of the bond between the ligand and the metal ion. Ligands can be classified into different types based on their ability to form bonds with metal ions. The stability of a complex increases with the strength of the bond between the ligand and the metal ion.

Strong field ligands, such as cyanide and carbon monoxide, form strong bonds with metal ions and are therefore more thermodynamically stable than weak field ligands, such as water and ammonia. This is because strong field ligands have a greater ability to split the d-orbitals of the metal ion, resulting in a greater stabilisation of the complex.

In addition to the strength of the bond, the size and shape of the ligand can also affect the thermodynamic stability of a complex. Bulky ligands, such as tertiary phosphines, can hinder the approach of other ligands and reduce the stability of the complex.

Overall, the thermodynamic stability of a complex is dependent on the type of ligand and its ability to form strong bonds with the metal ion. Strong field ligands are generally more thermodynamically stable than weak field ligands, and the size and shape of the ligand can also affect the stability of the complex.