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Direct 2 H NMR Observation of the Proton Mobility of the Acidic Sites of Anhydrous 12‐Tungstophosphoric Acid
Author(s) -
Kolokolov Daniil I.,
Kazantsev Maxim S.,
Luzgin Mikhail V.,
Jobic Hervé,
Stepanov Alexander G.
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201300291
Subject(s) - anhydrous , proton , chemistry , inorganic chemistry , nuclear magnetic resonance spectroscopy , nuclear chemistry , organic chemistry , nuclear physics , physics
Flip and hop before you′re caught! The proton dynamics of solid 12‐tungstophosphoric acid (TPA) is probed by solid‐state 2 H 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 OH bond at bridged oxygens of the Keggin anion, and the isotropic diffusion by hopping between neighboring surface oxygens of the anion.