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Dr. Daniil I. Kolokolov, Maxim S. Kazantsev, Dr. Mikhail V. Luzgin, Prof. Hervé Jobic and Prof. Alexander G. Stepanov Direct 2H NMR Observation of the Proton Mobility of the Acidic Sites of Anhydrous 12-Tungstophosphoric Acid ChemPhysChem 14

Article first published online: 16 APR 2013 | DOI: 10.1002/cphc.201300291

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Flip and hop before you′re caught! 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[BOND]H bond at bridged oxygens of the Keggin anion, and the isotropic diffusion by hopping between neighboring surface oxygens of the anion.

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