The vapor pressure measurement unit from borosilicate glass was assembled for determination of partial pressures of water in aggressive acidic media using the transpiration method. Three ternary systems H2O–HNO3–RE­(NO3)3 (RE = Pr, Nd, Sm) were investigated. The experimental results in ternary systems were compared with the estimation by the Pitzer model and Zdanovsky rule from the data of binary subsystems. In addition to vapor pressure measurements densities of investigated solutions were determined.

The evaporation and decomposition of cerium tetrafluoride CeF4(s) at high temperatures were studied by means of Knudsen Effusion Mass Spectrometry (KEMS). The saturated vapor pressure over CeF4(s) was determined by the isothermal evaporation of the sample from Pt Knudsen cell. The enthalpy of CeF4(s) sublimation was calculated using the second and the third laws of thermodynamics.

No abstract

The titular compound was characterized for the first time using a full range of spectroscopic methods, including UV, IR, 1H, and 13C NMR spectra. In solution, all methods showed a keto–enol equilibrium strongly shifted to the enol form. The X-ray structures determined for all simple 2-oxosuccinates showed only the enol form packed as hydrogen-bonded dimer stacks.