P31 nuclear magnetic relaxation, self-diffusion, and viscosity of tri-n-butylphosphate solutions in inert solvents
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The joint investigation of spin—lattice relaxation, self-diffusion, and viscosity makes it possible to come to some qualitative conclusions concerning the usefulness of the explicit expressions for correlation times in depicting the concentration dependences of time T1 in two-component mixtures of liquids. Parameter (T1ν)−1 varies nonlinearly with concentration for chemically noninteracting liquids. However, this cannot serve as an indication of the formation of associations in the solution since possible small conformational changes in the molecule containing the relaxing nuclei will affect the intramolecular contribution to the relaxation because of the strong dependence of this contribution on the effective distance between the dipole-interacting nuclei in complex molecules.
The dependence of the conformation of the TBP molecule on the type and concentration of the solvent could also be a cause affecting the reactivity of the extractant and the variation in the distribution coefficients during the extraction of metals with tributyl phosphate solutions.
The authors thank T. Ya. Vereshchagina for preparing the solutions and V. E. Samsonov for helping with the measurements.
KeywordsDistribution Coefficient Correlation Time Joint Investigation Complex Molecule Lattice Relaxation
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