Self-Diffusion of Ferulic and Sinapic Acids in the Binary Carbon Tetrachloride–Acetone-d6 System

1 H NMR with a pulsed magnetic field gradient method are used to measure the coefficients of self-diffusion of ferulic and sinapic acids in binary carbon tetrachloride–acetone-d6 solvent at temperatures of 278 and 298 K. Data show that the acids’ coefficients of self-diffusion grow along with the concentration of acetone-d6 and temperature. It is shown that the effective hydrodynamic radii of acids do not depend on the composition of the binary solvent within the experimental error. In light of molecular association, this behavior can be explained by the competition between two processes: acid–acetone heteroassociation and acid–acid self-association.