Aqueous Solutions Containing Small Hydrophobic Ions or Molecules

Aqueous Solutions Containing Small Hydrophobic Ions or Molecules 

The effect of organic cations with non-polar groups on the halide ion quadrupole relaxation is in general very different from that of inorganic cations. It was first reported by Lindman et al. [53] that the 7 9 

Hertz theory for the quadrupole relaxation of aqueous ions (see above). 

The broadening effect on halide NMR signals due to univalent organic cations, which may be orders of magnitude larger than that of other univalent cations, have been well characterized under various conditions and the most important observations are the following  

The halide ion quadrupole relaxation rate in the presence of alkylsubstituted ammonium ions increases strongly with increasing length of the alkyl chain, and with increasing substitution on the nitrogen 251 204 207], This is illustrated for Br in Fig. 

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