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  4. [Co(NH3)5Br)] SO4 and [Co(NH3)5SO4] Br are examples of which type of isomerism ?

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Q. $ [Co(NH_3)_5Br)] \,SO_4 $ and $ [Co(NH_3)_5SO_4] \,Br $ are examples of which type of isomerism ?

AMUAMU 2013Coordination Compounds

Solution:

$ [Co(NH_3)_5Br]SO_4$ and $[Co(NH_3)_5SO_4] Br$ are examples of ionisation isomerism. This form of isomerism arises when the counter ion in a complex salt is itself a potential ligand and can displace a ligand which can then become the counter ion.