1H NMR study of water molecules confined in nanochannels of mordenite

Behavior of water molecules entrapped in nanochannels of zeolite mordenite has been investigated by H-1 NMR technique. The H-1 spectra and spin-lattice relaxation times in the laboratory and rotating frames, T-1 and T-1p, respectively, as well as the dipolar relaxation time T-1D have been measured in the temperature range from 96 to 351 K. Diffusion of water molecules along the channels was observed above similar to 200 K. While in bulk liquid the dipolar ordered state of nuclear spins is not formed owing to complete motional average of dipolar interactions, we show that such a state is observed for mobile molecules confined in a restricted geometry. At temperatures below similar to 140 K the relaxation was found to be mainly caused by interaction of H-1 nuclear spins with paramagnetic impurities. Complete lost of the fine structure of H-1 spectra above similar to 320 K is attributed to isotropic molecular reorientation or/and proton exchange. We show that the dipolar relaxation in mordenite is responsive to slow 180 degrees reorientations of water molecules. The correlation times of nuclear and electron spin fluctuations were determined. (C) 2016 Elsevier Inc. All rights reserved.