pH-Dependent solution dynamics of a manganese(II)polyoxometalate, [Mn-4(H2O)(2)(P2W15O56)(2)](16-), and [Mn(H2O)(6)](2+)

• 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.

Ämnesord

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)

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