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[Co(NH₃)₅(H₂O)]³⁺ with bromide to give pentamminecobalt(III) bromide complex:
:[Co(NH₃)₅(H₂O)]³⁺ + Br^- -> [Co(NH₃)₅Br]²⁺ + H₂O

The mechanism of such reactions often invoke ion-pairing of the entering anion in the second coordination sphere followed by dissociation of the aquo ligand.

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