QENS and NMR studies of 3-picoline-water solutions

Almásy, László and Bánki, P. and Bellissent-Funel, M. C. and Bokor, Mónika Zsuzsanna and Cser, László and Jancsó, Gábor and Tompa, Kálmán (2002) QENS and NMR studies of 3-picoline-water solutions. APPLIED PHYSICS A - MATERIALS SCIENCE AND PROCESSING, 74. S516-S518. ISSN 0947-8396

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Abstract

Quasi-elastic neutron scattering measurements were performed on aqueous solutions of 3-picoline (3-methylpyridine) at room temperature. H-D substitution on both the solute and the water was used to separate the dynamics of the two species. The analysis of the translational diffusive motion at different concentrations shows that at high picoline content the diffusion coefficient of water decreases strongly and becomes similar to that of the solute, indicating strong coupling between the motions of the solute and the solvent. Activation energies characteristic of the dynamic behavior of the methyl group were determined from H-1 spin-lattice relaxation rate measurements for H2O and D2O solutions of 3-picoline above 310 K.

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