NUCLEAR MAGNETIC-RELAXATION STUDY OF THE SYSTEM METHANOL WATER/LITHIUM CHLORIDE/

The magnetic relaxation times of the nuclei H-1, H-2, and C-13 forming the methyl group of methanol have been measured in the mixture 20 mol % methanol + 80 mol% water which also contained LiCl in various amount s (1.73, 7.3 and 14.5 (m) over bar). Measurements were partly performe d at two frequencies and at variable temperatures so that at the lowes t temperatures the relaxation maxima were passed. It turned out that i n all cases the maximum relaxation rate was lower than expected making thus the conventional partial rigid body relaxation theory invalid. T he proton and deuteron relaxation times of the solvent water + methano l-hydroxyl and the Li-7 relaxation times were also measured in the sam e temperature range. We obtained the result that the rotational correl ation times of all solvent components (including LiCl) and the observe d slow motion residuum in the fast motion of the methyl group are equa l.