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Bromopentaamminecobalt(III) bromide

Bromopentaamminecobalt(III) bromide is the dibromide salt of the cobalt coordination compound with the formula [Co(NH3)5Br]2+. It is a purple, water-soluble solid. The analogous chloropentaamminecobalt(III) chloride is also well known.

Synthesis and reactions

The title compound is prepared by oxidation of a solution of cobalt(II) salts in aqueous ammonia.

:2 CoBr2 + 8 NH3 + 2 NH4Br + H2O2 → 2 [Co(NH3)5Br]Br2 + 2 H2O

It was first reported in the 1870s, before the structure or even formulae were understood for such complexes. This early work showed that only two thirds of the bromide groups were exchangeable with other anions such as nitrate and dithionate.

The complex undergoes aquation, meaning that bromide is displaced by water:

:[Co(NH3)5Br]Br2 + H2O → [Co(NH3)5(H2O)]Br3

This process is catalyzed by platinum.

References

References

  1. (1939). "Inorganic Syntheses".
  2. (1879). "Beiträge zur Chemie der Kobaltammoniakverbindungen. II. Ueber die Bromopurpureokobaltsalze". Journal für Praktische Chemie.
  3. (1970). "Heterogeneous Catalysis in Solution. Part VIII. Catalysis of the Aquation of the Bromopentaamminecobalt(III) Ion by Metallic Platinum". Journal of the Chemical Society.
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bromides cobalt-complexes cobalt(iii)-compounds ammine-complexes bromo-complexes
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