Toshihiko Amaya

The Hydrolysis of the Copper(II) Ion in Heavy Water

The hydrolysis of Be2+ ion in heavy water containing 3M NaClO4 as an ionic medium was investigated at 25°C by potentiometric titrations, employing a technique of constant-current coulometry. The deuterium-ion concentrations was measured by the use of a commercial glass electrode. The emf data in the range of the total beryllium concentration from 2.5 to 10 mM can be explained on the basis of the following complex formation: Be2(OD)3+, −logβ1,2=3.28±0.04; Be3(OD)33+, −logβ3,3=9.399±0.007; Be(OD)2, −logβ2,1=11.89±0.07. The composition of the species formed in heavy water is the same as that in light water, but the values of the stability constants are smaller in heavy water than in light water.

The Hydrolysis of Y 3+ , La 3+ , Gd 3 , and Er 3+ Ions in Heavy Water

Hydrolysis of Y/sup 3+/, La/sup 3+/, Gd/sup 3/+/, and Er/sup 3+/ ions in heav y water (D/sub 2/O) was studied. Compositions of the species formed in heavy water are the same as those in light water, while the values of the equilibrium constants are smaller in heavy water than in light water. (LK)

THERMODYNAMIC ISOTOPE EFFECT OF LITHIUM, CARBON, NITROGEN, CHLORINE, COPPER, AND URANIUM COMPOUNDS.

Few studies have so far been reported on isotopic frequency shifts, which present problems in experimentation. In this paper, the G and F matrix method is applied to theoretical calculation of the frequency shifts of linear molecules XYZ and XYZ, as well as of octahedral molecules XY 2 Using these values, reduced partition function ratios of lithium, carbon, copper, nitrogen, chlorine and uranium compounds have been calculated.

Notizen: Solvent Deuterium Isotope Effect on Hydrolysis of Nd3+ Ion

The hydrolysis equilibria of Nd3+ ion in light- and heavy-water solutions containing 3 mol dm-3 (Li)ClO4 as an ionic medium were studied at 25 °C by measuring the lyoniumion concentration with a glass electrode. Analysis of the emf data indicated the formation of only the mononuclear complex Nd(OL)2+ in both light and heavy water. The formation constant *β2,1 was smaller in D2O (log *β2,1 = —16.54 ± 0.04) than in H2O (log *β2,1 = —15.90 ± 0.06). The formation constant K2,1 for the heavy-water system (log K2,1 = 12.28) had a larger value than that for the light-water system (log K2,1 = 11.86).

Hydrolysis of Y

Hydrolysis of Y/sup 3+/, La/sup 3+/, Gd/sup 3/+/, and Er/sup 3+/ ions in heav y water (D/sub 2/O) was studied. Compositions of the species formed in heavy water are the same as those in light water, while the values of the equilibrium constants are smaller in heavy water than in light water. (LK)