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Carbon-13 magnetic resonance as a probe for solute-solvent interaction in dipolar heterocyclic media

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Abstract

Carbon-13 magnetic resonance shifts of solvent carbon atoms were measured as a function of solute concentration for a series of alkali metal salts inN-methyl-2-pyrrolidone and 3-methyl-2-oxazolidone, which are 5-membered dipolar-aprotic heterocyclic solvents of dielectric constants 32.0 and 77.5, respectively. Chemical shifts were linear functions of solute molarities in the concentration range of 0.19–0.75M. Cation-solvent interaction decreased in tenacity as Li+>Na+>K+. Shifts were anion dependent for both solvents, and the magnitude of solvent structure shielding, by solute anions, decreased as tetraphenylborate > thiocyanate > perchlorate. The carbonyl shifts ofN-methyl-2-pyrrolidone and 3-methyl-2-oxazolidone were compared to other heterocyclic solvents.

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Authors and Affiliations

  1. Department of Chemistry, University of Florida, 32611, Gainesville, Florida

    Joseph Rosenfarb & Thomas D. Baugh

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  1. Joseph Rosenfarb
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  2. Thomas D. Baugh
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Rosenfarb, J., Baugh, T.D. Carbon-13 magnetic resonance as a probe for solute-solvent interaction in dipolar heterocyclic media. J Solution Chem 7, 457–462 (1978). https://doi.org/10.1007/BF00646116

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  • DOI: https://doi.org/10.1007/BF00646116

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