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Angeles. The use of the research facilities is very much appreciated. P.C.H. also thanks the National Science Foundation who made the research possible. ORNL is operated by Martin Marietta Energy Systems, Inc., for the U. S. Department of Energy under contract DE-AC05-840R21400.

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Solvation effects of Li+, Na+, and Mg2+ on the mixed solvent dimethylformamide-water were investigated by the 1H NMR method. The dependence of the chemical shift of solvent protons on the mixed solvent composition was established for various concentrations of perchlorates. Isosolvation points were determined, and the dependences of charge transfer from solvent to cation on the chemical shift of solvent, as obtained by a quantum chemical calculation, were compared for the systems DMF-Mn+ and DMF-Mn+-H2O.

Liquidus curves of the phase diagram for the system water-dimethyl sulphoxide (DMSO) have been calculated in such a way as to give a good fit to experimental data for the phase diagram. The calculation is based on the assumption of an equilibrium chemical reaction yielding DMSO.3 H2O, and on the relation for the excess Gibbs energy in a ternary system composed of the two starting components and their compound. The data for the temperature dependence of the difference in the heat capacities of the liquid and solid phases of the pure components in the supercooling region have been obtained by extrapolation of experimental data in the case of DMSO, and for water by adopting published data measured down to -40 °C and by estimating their further trend.