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pH-Dependent solution dynamics of a manganese(II)polyoxometalate, [Mn-4(H2O)(2)(P2W15O56)(2)](16-), and [Mn(H2O)(6)](2+)
2015 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 44, no 44, p. 19068-19071Article in journal (Refereed) Published
Abstract [en]

The aqueous reaction dynamics of the manganese(II)-functionalised Wells-Dawson polyoxometalate [Mn-4(H2O)(2)(P2W15O56)(2)](16-) has been determined as a function of pH using variable temperature O-17 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 x 10(7) s(-1) at pH 3.2 to 1.3 x 10(6) s(-1) at pH 6.0. This decrease in the rate of exchange correlates with the deprotonation of the polyoxometalate framework.

Place, publisher, year, edition, pages
2015. Vol. 44, no 44, p. 19068-19071
National Category
Inorganic Chemistry Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-129109DOI: 10.1039/c5dt03138aISI: 000364146400006PubMedID: 26490076OAI: oai:DiVA.org:umu-129109DiVA, id: diva2:1058604
Available from: 2016-12-21 Created: 2016-12-21 Last updated: 2018-06-09Bibliographically approved

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Ohlin, C. Andre

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