It has been suggested in the literature that Co(NH3)5OH2+ reacts with S02 in aqueous solution to produce an O-bonded sulfilo complex Co(NH3)5OS02+, which on acidification releases S02 and forms the corresponding aquo complex. The kinetics of both processes suggested that no Co-0 bond breakage is involved. l70-exchange experiments have now been performed with nO NMR and indicate that the earlier suggestions are correct.
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