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

Volume 37, Number 1 (Feb. 1983) Page 29-31

Dando, Neal R.; Gold, Harvey S.; Dybowski, Cecil

Carbon-13 nuclear magnetic resonance spectrometry is used to observe changes in the spin-lattice relaxation time (T1) of the alkyl chain carbons of symmetric tetraalkylammonium salts (R4N+)X in acetonitrile as a function of salt concentration in the range from 0.25 to 1.4 M. The T1 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.