Direct 2H NMR observation of the proton mobility of the acidic sites of anhydrous 12-tungstophosphoric acid

Daniil I. Kolokolov, Maxim S. Kazantsev, Mikhail V. Luzgin, Hervé Jobic, Alexander G. Stepanov

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

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-H bond at bridged oxygens of the Keggin anion, and the isotropic diffusion by hopping between neighboring surface oxygens of the anion.

Original languageEnglish
Pages (from-to)1783-1786
Number of pages4
JournalChemPhysChem
Volume14
Issue number9
DOIs
Publication statusPublished - 24 Jun 2013
Externally publishedYes

Keywords

  • heterogeneous catalysis
  • NMR spectroscopy
  • proton mobility
  • solid heteropolyacids
  • solid state

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