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Question
Which of the following complexes show linkage isomerism?
(i) \[\ce{[Co(NH3)5 (NO2)]^{2+}}\]
(ii) \[\ce{Co(H2O)5 CO]^{3+}}\]
(iii) \[\ce{[Cr(NH3)5 SCN]^{2+}}\]
(iv) \[\ce{Fe(en)2 Cl2]^+}\]
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Solution
(i) \[\ce{[Co(NH3)5 (NO2)]^{2+}}\]
(iii) \[\ce{[Cr(NH3)5 SCN]^{2+}}\]
Explanation:
In the given complexes at \[\ce{[Co(NH3)5 (NO2)]^{2+}}\] and \[\ce{[Cr(NH3)5 SCN]^{2+}}\] the central metal atom (i.e. Co and Cr respectively) are bonded with ligands \[\ce{NO2}\] and \[\ce{SCN}\] separately. These ligands are ambidentate ligands and can link themselves with the central atom in two different ways exhibiting linkage isomerism (as mentioned below) -
In \[\ce{NO2}\] linkage isomerism arises in a coordination compound containing ambidentate ligand. A simple example is provided by complexes containing the thiocyanate ligands. \[\ce{NCS^-}\], which may bind through the nitrogen to give \[\ce{M-NCS}\] or through sulpur to give \[\ce{M-SCN}\].
In \[\ce{NO2}\] such behaviour in the complex \[\ce{[Co(NH3)5NO2]^{+2}}\], obtained in the red form, when nitrite ligand is bound through oxygen \[\ce{(ONO)}\], and in yellow form, when the nitrite ligand is bound through nitrogen (–NO2)
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RELATED QUESTIONS
The complex ion `[Co(H_2O)_5 (ONO)]^(2+) `
(A) linkage isomer
(B) ionisation isomer
(C) co-ordination isomer
(D) geometrical isomer
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Write the IUPAC name of the complex [Cr(NH3)4Cl2]+. What type of isomerism does it exhibit?
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Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type \[\ce{Pd(C6H5)2 (SCN)2]}\] and \[\ce{[Pd(C6H5)2 (NCS)2]}\] are ______.
The compounds \[\ce{[CO(SO4)(NH3)5]Br}\] and \[\ce{[Co(SO4)(NH3)5]Cl}\] represent
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Name the type of isomerism when ambidentate ligands are attached to central metal ion. Give two examples of ambidentate ligands.
Match the complex species given in Column I with the possible isomerism given in Column II and assign the correct code:
| Column I (Complex species) | Column II (Isomerism) |
| A. \[\ce{[Co(NH3)4 Cl2]^+}\] | 1. optical |
| B. \[\ce{cis-[Co(en)2 Cl2]^+}\] | 2. ionisation |
| C. \[\ce{[Co(NH3)5 (NO2)]Cl2}\] | 3. coordination |
| D. \[\ce{[Co(NH3)6][Cr(CN)6]}\] | 4. geometrical |
| 5. linkage |
Assertion: Linkage isomerism arises in coordination compounds containing ambidentate ligand.
Reason: Ambidentate ligand has two different donor atoms
CoSO4Cl.5NH3 exists in two isomeric forms ‘A’ and ‘B’. Isomer ‘A’ reacts with AgNO3 to give white precipitate, but does not react with BaCl2. Isomer ‘B’ gives white precipitate with BaCl2 but does not react with AgNO3. Answer the following questions.
- Identify ‘A’ and ‘B’ and write their structural formulas.
- Name the type of isomerism involved.
- Give the IUPAC name of ‘A’ and ‘B’.
The diamagnetic species is:-
