Question:medium
Identify pair of complexes that exhibits solvate isomerism?
Identify pair of complexes that exhibits solvate isomerism?
Show Hint
Look for the movement of $H_2O$ molecules across the square brackets $[ \ ]$.
Updated On: May 14, 2026
- $[\text{Cr}(\text{H}_2\text{O})_6]\text{Cl}_3$ and $[\text{Cr}(\text{H}_2\text{O})_5\text{Cl}]\text{Cl}_2 \cdot \text{H}_2\text{O}$
- $[\text{Co}(\text{NH}_3)_5\text{SO}_4]\text{Br}$ and $[\text{Co}(\text{NH}_3)_5\text{Br}]\text{SO}_4$
- $[\text{Co}(\text{NH}_3)_6][\text{Cr}(\text{CN})_6]$ and $[\text{Cr}(\text{NH}_3)_6][\text{Co}(\text{CN})_6]$
- $[\text{Fe}(\text{H}_2\text{O})_5\text{SCN}]^+$ and $[\text{Fe}(\text{H}_2\text{O})_5\text{NCS}]^+$
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Solvate (or hydrate) isomerism occurs when water (or solvent) molecules move between the coordination sphere (inner) and the lattice (outer).
Step 2: Key Formula or Approach:
Look for water molecules of hydration ($\cdot \text{H}_2\text{O}$) outside the bracket and varying number of aqua ligands inside.
Step 3: Detailed Explanation:
- (A) The first has 6 water molecules as ligands. The second has 5 as ligands and 1 in the crystal lattice. This is hydrate isomerism.
- (B) is ionization isomerism (ions swap).
- (C) is coordination isomerism (metals swap).
- (D) is linkage isomerism (ambidentate ligand).
Step 4: Final Answer:
The pair in (A) exhibits solvate isomerism.
Solvate (or hydrate) isomerism occurs when water (or solvent) molecules move between the coordination sphere (inner) and the lattice (outer).
Step 2: Key Formula or Approach:
Look for water molecules of hydration ($\cdot \text{H}_2\text{O}$) outside the bracket and varying number of aqua ligands inside.
Step 3: Detailed Explanation:
- (A) The first has 6 water molecules as ligands. The second has 5 as ligands and 1 in the crystal lattice. This is hydrate isomerism.
- (B) is ionization isomerism (ions swap).
- (C) is coordination isomerism (metals swap).
- (D) is linkage isomerism (ambidentate ligand).
Step 4: Final Answer:
The pair in (A) exhibits solvate isomerism.
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