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Q5.1:
Explain the bonding in coordination compounds in terms of Werner’s postulates.

Solution :

1. Theoretical Foundations of Werner’s Postulates

Alfred Werner, the pioneer of coordination chemistry, proposed the following postulates to describe the nature of bonding in coordination compounds:

  • Dual Valency: Every metal atom in a coordination compound exhibits two types of valencies: Primary Valency and Secondary Valency.
  • Ionizable Primary Valency: Primary valencies are ionizable and correspond to the oxidation state of the central metal ion. These are satisfied by negative ions.
  • Non-Ionizable Secondary Valency: Secondary valencies are non-ionizable and correspond to the coordination number of the metal. These are satisfied by ligands (neutral molecules or negative ions) [Per Werner’s Coordination Theory].
  • Spatial Arrangement: The secondary valencies are directed in space around the central metal ion, determining the geometry of the complex.

2. Comparative Analysis of Valencies

Characteristic Primary Valency Secondary Valency
Nature Ionizable Non-ionizable
Representation Satisfies Oxidation State Satisfies Coordination Number
Bonding Type Ionic (Electrostatic) Coordinate Covalent (Dative)

3. Visualization of Bonding (e.g., $[Co(NH_3)_6]Cl_3$)

In this complex, $Co^{3+}$ has a primary valency of 3 (satisfied by $3Cl^-$ ions) and a secondary valency of 6 (satisfied by $6NH_3$ molecules).

Co NH₃ NH₃ NH₃ NH₃ Cl⁻

4. Logical Derivation of Bonding

  1. Step 1: Identify the central metal cation, which acts as an electron pair acceptor [Per Lewis Acid-Base Theory].
  2. Step 2: Evaluate the coordination sphere. Ligands bonded directly to the metal via secondary valency remain within the sphere $[ML_n]$ and do not dissociate in water.
  3. Step 3: Calculate the oxidation state; the ions balancing this charge (located outside the coordination sphere) constitute the primary valency and are fully dissociated in aqueous solutions.

Final Solution: Werner’s postulates establish that bonding in coordination compounds is bifurcated into primary valency (oxidation state, ionizable, ionic bonds) and secondary valency (coordination number, non-ionizable, coordinate covalent bonds directed in specific spatial geometries).


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