QuestionMay 10, 2025

Which of the following pairs of coordination compounds or complex ions are examples of coordination isomers? [Ti(H_(2)O)_(6)]^3+ and [Ti(NH_(3))_(6)]^3+ [Fe(NH_(3))_(2)(H_(2)O)_(4)]Cl_(2) and [Fe(NH_(3))_(2)(H_(2)O)_(4)]I_(2) [Cr(CO)_(5)NO_(2)]^2+ and [Cr(CO)_(5)ONO]^2+ [Cu(NH_(3))_(5)Br]Cl and [Cu(NH_(3))_(5)Cl]Br [MnCl_(3)Br]^2- and [MnClBr_(3)]^2-

Which of the following pairs of coordination compounds or complex ions are examples of coordination isomers? [Ti(H_(2)O)_(6)]^3+ and [Ti(NH_(3))_(6)]^3+ [Fe(NH_(3))_(2)(H_(2)O)_(4)]Cl_(2) and [Fe(NH_(3))_(2)(H_(2)O)_(4)]I_(2) [Cr(CO)_(5)NO_(2)]^2+ and [Cr(CO)_(5)ONO]^2+ [Cu(NH_(3))_(5)Br]Cl and [Cu(NH_(3))_(5)Cl]Br [MnCl_(3)Br]^2- and [MnClBr_(3)]^2-
Which of the following pairs of coordination compounds or complex ions are examples of coordination isomers? [Ti(H_(2)O)_(6)]^3+ and [Ti(NH_(3))_(6)]^3+ [Fe(NH_(3))_(2)(H_(2)O)_(4)]Cl_(2) and [Fe(NH_(3))_(2)(H_(2)O)_(4)]I_(2) [Cr(CO)_(5)NO_(2)]^2+ and [Cr(CO)_(5)ONO]^2+ [Cu(NH_(3))_(5)Br]Cl and [Cu(NH_(3))_(5)Cl]Br [MnCl_(3)Br]^2- and [MnClBr_(3)]^2-

Solution
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Answer

[Cu(NH_{3})_{5}Br]Cl and [Cu(NH_{3})_{5}Cl]Br Explanation 1. Define coordination isomers Coordination isomers occur when the composition of the ligands in the coordination sphere and the counterions are interchanged. 2. Analyze each pair 1. [Ti(H_{2}O)_{6}]^{3+} and [Ti(NH_{3})_{6}]^{3+}: These differ in ligands but not in ligand-counterion exchange, so **not coordination isomers**. 2. [Fe(NH_{3})_{2}(H_{2}O)_{4}]Cl_{2} and [Fe(NH_{3})_{2}(H_{2}O)_{4}]I_{2}: Counterions differ (Cl vs I), but no exchange with ligands, so **not coordination isomers**. 3. [Cr(CO)_{5}NO_{2}]^{2+} and [Cr(CO)_{5}ONO]^{2+}: Same formula, different ligand connectivity (linkage isomerism), so **not coordination isomers**. 4. [Cu(NH_{3})_{5}Br]Cl and [Cu(NH_{3})_{5}Cl]Br: Ligand (Br/Cl) and counterion are exchanged, so **coordination isomers**. 5. [MnCl_{3}Br]^{2-} and [MnClBr_{3}]^{2-}: Different ligand arrangement, but no exchange with counterions, so **not coordination isomers**.

Explanation

1. Define coordination isomers<br /> Coordination isomers occur when the composition of the ligands in the coordination sphere and the counterions are interchanged.<br /><br />2. Analyze each pair<br /> 1. $[Ti(H_{2}O)_{6}]^{3+}$ and $[Ti(NH_{3})_{6}]^{3+}$: These differ in ligands but not in ligand-counterion exchange, so **not coordination isomers**.<br /> 2. $[Fe(NH_{3})_{2}(H_{2}O)_{4}]Cl_{2}$ and $[Fe(NH_{3})_{2}(H_{2}O)_{4}]I_{2}$: Counterions differ (Cl vs I), but no exchange with ligands, so **not coordination isomers**.<br /> 3. $[Cr(CO)_{5}NO_{2}]^{2+}$ and $[Cr(CO)_{5}ONO]^{2+}$: Same formula, different ligand connectivity (linkage isomerism), so **not coordination isomers**.<br /> 4. $[Cu(NH_{3})_{5}Br]Cl$ and $[Cu(NH_{3})_{5}Cl]Br$: Ligand (Br/Cl) and counterion are exchanged, so **coordination isomers**.<br /> 5. $[MnCl_{3}Br]^{2-}$ and $[MnClBr_{3}]^{2-}$: Different ligand arrangement, but no exchange with counterions, so **not coordination isomers**.
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