Select correct statements: (1) [Ni(en)3]^2+ is less stable than [Ni(NH3)0]^2+ (2) Increase in st

step 1 Dear students in problem 52 of chapter 7 we asked to select the correct statements and from the

Select correct statements: (1) [Ni(en)3]^2+ is less stable...

Select correct statements: (1) $\left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}$ is less stable than $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{0}\right]^{2+}$ (2) Increase in stability of the complexes due to the presence of multidentate cyclic ligand is called macro-cyclic eflect. (3) $\left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}$ is more stable than $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}$ (4) For a given ion and ligand, the greater the charge on the metal ion, the greater is the stability.

Select correct statements:
(1) $\left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}$ is less stable than $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{0}\right]^{2+}$
(2) Increase in stability of the complexes due to the presence of multidentate cyclic ligand is called macro-cyclic eflect.
(3) $\left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}$ is more stable than $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}$
(4) For a given ion and ligand, the greater the charge on the metal ion, the greater is the stability.

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Key Concepts

Chelate Effect

The chelate effect refers to the enhanced stability observed when a multidentate (chelate) ligand forms one or more rings with a central metal ion, compared to a similar complex formed with equivalent monodentate ligands. This effect arises from favorable entropy changes and often increased binding enthalpy, resulting in more robust and stable complexes.

Macrocyclic Effect

The macrocyclic effect is a special case of the chelate effect where the ligand is a large, cyclic molecule that can encapsulate the metal ion within a rigid ring structure. This preorganized cyclic framework leads to exceptionally high stability in the resulting complex, as the reduction in conformational flexibility and entropic penalty upon binding often surpasses that of acyclic chelating ligands.

Metal Ion Charge Influence

In coordination chemistry, the stability of a complex is also significantly impacted by the charge on the central metal ion. Generally, a higher positive charge on the metal ion results in stronger electrostatic attractions with the electron-rich donor atoms in the ligands, thereby increasing the overall stability of the complex.

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