pH-dependent solution dynamics of a manganese(II) polyoxometalate, [Mn4(H2O)2(P2W15O56)2]16-, and [Mn(H2O)6]2+

Rupali Sharma, Jie Zhang, Christian Andre Ohlin

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The aqueous reaction dynamics of the manganese(ii)-functionalised Wells-Dawson polyoxometalate [Mn4(H2O)2(P2W15O56)2]16- has been determined as a function of pH using variable temperature 17O NMR, and compared with that of the well-studied monomeric manganese(ii) hexa-aqua ion, [Mn(H2O)6]2+. While the rate of aquo-ligand exchange on the hexa-aqua ion remains independent of pH in the range 3.2-6.0, the rate of water exchange of the polyoxometalate ion varies by a factor of fifteen, from 1.98 × 107 s-1 at pH 3.2 to 1.3 × 106 s-1 at pH 6.0. This decrease in the rate of exchange correlates with the deprotonation of the polyoxometalate framework.
Original languageEnglish
Pages (from-to)19068-19071
Number of pages4
JournalDalton Transactions
Issue number44
Publication statusPublished - 2015

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