Closed-shell ion pair aggregation in non-polar solvents characterized by NMR diffusion measurements

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Abstract
Closed-shell ion pairs, formed by tetrabutylammonium chloride, aggregate in C2HCl3 solution; stimulated-echo NMR experiments incorporating pulsed field gradients yielded diffusion coefficients for the aggregates and comparison of aggregate diffusion with that of an internal standard of similar size and shape (Bu4Si) was used to determine the extent of aggregation; temperature and concentration effects indicate that aggregation is primarily entropy-driven.