Behavior of water molecules entrapped in nanochannels of zeolite mordenite has been investigated by 1H NMR technique. The 1H spectra and spin-lattice relaxation times in the laboratory and rotating frames, T1 and T1ρ, respectively, as well as the dipolar relaxation time T1D have been measured in the temperature range from 96 to 351 K. Diffusion of water molecules along the channels was observed above ∼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 ∼140 K the relaxation was found to be mainly caused by interaction of 1H nuclear spins with paramagnetic impurities. Complete lost of the fine structure of 1H spectra above ∼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° reorientations of water molecules. The correlation times of nuclear and electron spin fluctuations were determined.
- Dipolar ordered state
- Molecular mobility
ASJC Scopus subject areas
- Chemistry (all)
- Nuclear and High Energy Physics