Direct 2H NMR Observation of the Proton Mobility of the Acidic Sites of Anhydrous 12‐Tungstophosphoric Acid. Issue 9 (16th April 2013)

• Record Type: Journal Article
• Authors: Kolokolov, Daniil I.; Kazantsev, Maxim S.; Luzgin, Mikhail V.; Jobic, Hervé; Stepanov, Alexander G.
• Is Part Of: Chemphyschem. Volume 14:Issue 9(2013)
• Page Start: 1783
• Page End: 1786
• Publication Date: 2013-04-16
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201300291
• Languages: English
• ISSNs: 1439-4235

Abstract

<abstract abstract-type="graphical" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p> <bold>Flip and hop before you′re caught!</bold> The proton dynamics of solid 12‐tungstophosphoric acid (TPA) is probed by solid‐state ²H NMR in a temperature range from 293–503 K. Protons of TPA are shown to be involved in two types of molecular motion (see picture): the anisotropic local two‐site flipping between the two possible orientations of the OH bond at bridged oxygens of the Keggin anion, and the isotropic diffusion by hopping between neighboring surface oxygens of the anion.<boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgg2248wq8h" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>