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Solute 13C Nuclear Magnetic Resonance Spectrometric Investigation of Acetonitrile-Tetraalkylammonium Salt Interactions

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Carbon-13 nuclear magnetic resonance spectrometry is used to observe changes in the spin-lattice relaxation time (T 1) of the alkyl chain carbons of symmetric tetraalkylammonium salts (R 4N+)X in acetonitrile as a function of salt concentration in the range from 0.25 to 1.4 M. The T 1 values of the alkyl chain carbons are observed to be differentially sensitive to salt concentration, the sensitivity being greatest at the α carbon position. These observations suggest accessibility of the cation nitrogen to solvent molecules and changing microviscosity about the salt molecule.

Keywords: 13C NMR, carbon-13 NMR; Acetonitrile, tetraalkylammonium salt; Solvent-solute interactions

Document Type: Research Article


Affiliations: Department of Chemistry, University of Delaware, Newark, Delaware 19711

Publication date: January 1, 1983

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