An alternative mechanism for the formation of the cobalt(III) molybdate cation, Co(NH3)5MoO4 +

Michael R. Grace, Peter A. Tregloan

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An alternative mechanism is proposed for the formation of Co(NH3)5MoO4 + from Co(NH3)5H2O3+ and MoO4 2- in slightly basic solution (pH 7.1-8.0). The observed second-order rate dependence upon [MoO4 2-] may be explained by HMoO4 - acting as a proton-donating catalyst, in contrast to the previously postulated mechanism involving the formation of dimeric molybdenum(VI) species. An increase in reaction rate was also caused by the addition of other protonated anions (HCO3 -, H2PO4 -) to the reaction solution, thus supporting the contention of a general proton-assisted mechanism. No evidence of dimeric molybdenum(VI) was found.

Original languageEnglish
Pages (from-to)2317-2329
Number of pages13
Issue number19
Publication statusPublished - 1 Jan 1991
Externally publishedYes

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