Sodium-23 nuclear magnetic resonance of resins and mixed solvent systems

Michael Goldsmith, Doris Hor, Raymond Damadian

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The sodium-23 spin-lattice relaxation time (T1) was determined at 10 MHz on Dowex 50W-X2 ion exchanger resin as a function of the dielectric constant of the solvent. The relaxation time varied from 24.8 msec in distilled water ( D = 78.5) to values too short to determine in water-ethanol mixtures below a dielectric constant of 35. Similar studies were conducted on 250 mm sodium bisulfite (NaHSO3) in a series of aqueous-nonaqueous mixtures. The results indicate that T1 may be expressed as a function of the macroscopic dielectric constant for any binary solvent system. For systems with a dielectric constant greater than 65 the relationship is given by T1 = a exp(bD), where a and b are constants for a particular solvent system.

Original languageEnglish
Pages (from-to)1708-1710
Number of pages3
JournalJournal of Chemical Physics
Issue number5
StatePublished - 1976
Externally publishedYes


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