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Effect of lithium cation on the relaxation mechanisms of acids and alcohols
Author(s) -
Lambert Joseph B.,
Simpson Sharon Vlasak
Publication year - 1985
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260230202
Subject(s) - chemistry , trifluoroacetic acid , lithium chloride , lithium (medication) , acetic acid , relaxation (psychology) , chloride , acetyl chloride , potassium , alcohol , inorganic chemistry , dipole , ethanol , organic chemistry , catalysis , medicine , social psychology , psychology , endocrinology
The effect of lithium chloride on the relaxation mechanisms of simple acid and alcohols has been examined. Dipolar relaxation is predominant for acetic acid and ethanol. Lithium chloride (approximately 10%) significantly increases the rate of dipolar relaxation for all carbons and protons of acetic acid, probably through an increase in aggregate size or viscosity. Lithium chloride (approximately 1.5%) has a similar but smaller effect on the protons of ethanol. The methyl carbons and fluorines of trifluoroacetic acid and 2,2,2‐trifluoroethanol relax primarily by spin‐rotation. With about 10% lithium chloride, dipolar relaxation becomes more important for trifluoroacetic acid. With about 1.5% lithium chloride, trifluoroethanol possibly shows an enhancement of spin‐rotation relaxation for the CF 3 nuclei.