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Coordination Chemistry: Linkage Isomers
The complex [Co(NH3)5(NO2)]2+ has two isomeric forms, which are known as linkage isomers.
Pentaamminenitrocobalt(III) chloride is a yellow compound; pentaamminenitritocobalt(III) chloride is a red compound.
The [Co(NH3)5(NO2)]2+ ion contains five NH3 ligands and one NO2-
ligand. Carefully examine the structures shown below.
- What is the difference between the two linkage isomers?
- Formulate a definition for the term "linkage isomers".
- Draw the Lewis structure for the nitrite ion: NO2-.
Explain how two different types of bonding are possible for this ligand.
- Can the NH3 ligand bond in two different ways? Why or why not? (A Lewis structure will prove helpful.)
- Other ligands that show linkage isomers are the thiocyanate ion (SCN-) and the cyanate ion (OCN-).
Draw Lewis structures for these ligands and identify the different modes of bonding for each ligand.
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