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

Research output: Contribution to journalArticleOtherpeer-review

4 Citations (Scopus)

Abstract

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
Volume44
Issue number44
DOIs
Publication statusPublished - 2015

Cite this

@article{6a6c079849f54ceb9693b687702c0a86,
title = "pH-dependent solution dynamics of a manganese(II) polyoxometalate, [Mn4(H2O)2(P2W15O56)2]16-, and [Mn(H2O)6]2+",
abstract = "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.",
author = "Rupali Sharma and Jie Zhang and Ohlin, {Christian Andre}",
year = "2015",
doi = "10.1039/c5dt03138a",
language = "English",
volume = "44",
pages = "19068--19071",
journal = "Journal of the Chemical Society. Dalton Transactions",
issn = "1477-9226",
publisher = "The Royal Society of Chemistry",
number = "44",

}

pH-dependent solution dynamics of a manganese(II) polyoxometalate, [Mn4(H2O)2(P2W15O56)2]16-, and [Mn(H2O)6]2+. / Sharma, Rupali; Zhang, Jie; Ohlin, Christian Andre.

In: Dalton Transactions, Vol. 44, No. 44, 2015, p. 19068-19071.

Research output: Contribution to journalArticleOtherpeer-review

TY - JOUR

T1 - pH-dependent solution dynamics of a manganese(II) polyoxometalate, [Mn4(H2O)2(P2W15O56)2]16-, and [Mn(H2O)6]2+

AU - Sharma, Rupali

AU - Zhang, Jie

AU - Ohlin, Christian Andre

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

UR - http://pubs.rsc.org.ezproxy.lib.monash.edu.au/en/content/articlepdf/2015/dt/c5dt03138a?page=search

U2 - 10.1039/c5dt03138a

DO - 10.1039/c5dt03138a

M3 - Article

VL - 44

SP - 19068

EP - 19071

JO - Journal of the Chemical Society. Dalton Transactions

JF - Journal of the Chemical Society. Dalton Transactions

SN - 1477-9226

IS - 44

ER -