Toshiki Wakabayashi

Apparent and partial molar volumes of quaternary phosphonium halides in aqueous solutions

The apparent and partial molar volumes in aqueous solution were obtained for (n-Bu)4PBr and (n-Bu)4-nPhnPCl (n=1–4) at six temperatures from 1 to 55°C. The apparent molar expansibilities were also obtained. The hydrophobic character of the cations is reduced by replacing butyl groups with phenyl groups, as evidenced by the decrease in the magnitudes of the Bv-coefficient (negative for all n) and of the temperature dependent extrema found in the apparent molar volumes and expansibilities as a function of concentration. However, the extrema exist even with BuPh3PCl at low temperatures. The result suggests that the phenyl groups weakly affect the butyl cospheres and cation-cation interactions.

Apparent molal volumes of phosphonium halides at 15, 25 and 35°C

AbstractThe densities of aqueous solutions of the phosphonium halides, Bu4-nPhnPX(n=0–4), some of which were synthesized from the phosphines, were measured at 15, 25 and 35°C. Partial molal volumes at infinite dilution,

Volumetric study on a Co(III) rotaxane complex in aqueous solutions at 25°C

\bar V^\circ

DISTRIBUTION OF THENOYLTRIFLUOROACETONE AND ITS SCANDIUM CHELATE IN KETONE SOLVENT SYSTEM.

, and Bv coefficients for the apparent molal volumes were determined at each temperature. For the first four cations

The Effect of Quaternary Phosphonium Halides on the Temperature of the Maximum Density of Water

(n< 4) \bar V_ + ^o

Hydration of Quaternary Phosphonium Bromides, Bu4−nPhnPBr, in Chloroform

varies little with n. For all salts Bv are negative but become less negative with increasing n. The temperature dependence of Bv is positive for butyl-rich salts (n<2) but negative for phenyl-rich salts (n>1). Also it appears that