Abstract
The present study uses 13 C-NMR chemical shifts, multifield 13 C relaxation and self-diffusion coefficients to study the two-component system sodium octanoate—octanoic acid. The shift and relaxation data strongly indicate the presence of sodium octanoate—octanoic acid complexes. 13 C-spin—lattice relaxation and nuclear Overhauser enhancement are used to characterize the hydrocarbon-chain order and mobility. A strong frequency-dependent relaxation is found. It is shown that the formation of complexes is governed by a very high equilibrium constant. Thus, it is valid to consider all sodium octanoate and octanoic acid as being present in the complexes. Although the molar ratio of sodium octanoate to octanoic acid and the aggregation number in the complexes cannot be determined, it can be concluded to be constant when the sodium-octanoate concentration is varied. The self-diffusion coefficient shows an accentuated decrease as sodium octanoate is added to octanoic acid. It is suggested that this is due to hydrogen bonding of octanoic acid to the complex.
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