Abstract
The 1H spin–lattice relaxation times and high-resolution solid-state nuclear magnetic resonance (NMR)under fast magic spinning were used to study the structural dynamics in the proton-conductingmaterial imidazolium oxalate. The measurements provide evidence for the ordered anddisordered domains within the studied material. The two components drastically differ in their1H spin–latticerelaxation times and 1H–13C cross-polarization magic-angle-spinning (CP/MAS) spectra. The coalescence phenomenonof the resonances of the basal carbons of the imidazole ring undergoing a reorientation isobserved only for mobile molecules in the disordered domains. Therefore, only thesemolecules can be responsible for proton conductivity allowing for the Grotthus mechanism.
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