Ilzida I. Shakirova

Compressibility of liquids. Rule of noncrossing V-P curvatures.

Weight analysis of the liquid introduced into the stainless steel bomb under pressures up to 1 kbar in the temperature range of 20-50 degrees C at the interval of 10 degrees C was performed for 1,4-dioxane, acetonitrile, toluene, ethyl acetate, chlorobenzene, and n-hexane. The coefficients of the Tait equation were determined for all of the solvents at each temperature. There was a clear linear relation between the tangent bulk modulus (1/beta T) at atmospheric pressure (1 bar) and the secant bulk modulus at 1 kbar; 1/betaT=0.9865 x (1000 V0/DeltaV(1kbar))-4559 was found at a wide range of temperatures for different liquids, including glycerol and even mercury. This represents the rule of noncrossing P-V curvatures for the liquids. Using the correlation, it is possible to predict the coefficients (C, B) of the Tait equation from the experimental data of betaT at 1 bar or, on the other hand, to calculate the value of betaT from experimental compression at high pressures.

Studying the effect of high pressure on the cycloaddition reactions of maleic anhydride and substituted anthracenes

The kinetics (rate, activation, and volume) of the high-pressure (up to 2500 bar) Diels-Alder reactions of maleic anhydride with 9-phenylanthracene and 9,10-dimethylanthracene in toluene is investigated.

Internal and external factors promoting the Diels-Alder reaction

The basic chemical and physical factors determining the rate and equilibrium of the Diels-Alder reaction under standard and high hydrostatic pressures were considered. The search for favorable conditions for this process makes it possible to extend the range of potential reactants and to perform reactions that earlier considered to be forbidden.

Heats of Solution of Liquid Solutes in Various Solvents

The values of the heats of solution (2131 solutions) of different liquid solutes in organic and inorganic solvents were obtained from the literature data on the heat of mixing (Δmix𝐻) in the wide range of concentrations. The limit values of the heat of solution of a solute (𝑖) in a solvent (𝑗) (Δsoln𝐻𝑖/𝑗) were calculated from the limit data of the dependence Δmix𝐻/𝑥𝑖versus𝑥𝑖 at 𝑥𝑖→0 and the values of that of a solute (𝑗) in a solvent (𝑖) (Δsoln𝐻𝑗/𝑖) from the limit data of the dependence Δmix𝐻/𝑥𝑗versus𝑥𝑗 at 𝑥𝑗→0, respectively.

Anomalies in the Change of Volumetric Parameters of the Diels–Alder Reaction in Solution

In this article negative values of the activation volume in retro-Diels–Alder reactions are interpreted in terms of the different possibilities of penetration of the solvent molecules into the sterically branched structures of the adduct and activated complex. Empty spaces, inaccessible to penetration of solvent molecules, lead to increases of the molar volume of the screened adducts in solution and, consequently, to a less negative value of the Diels–Alder reaction volume. The values of partial molar volumes of anthracene, maleic anhydride and the adducts cyclopentadiene–maleic anhydride, anthracene–maleic anhydride and anthracene–tetracyanoethylene, in several solvents, were calculated from the solution density data.

Partial molar volumes of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate in n-donor solvents

The values of partial molar volume (PMV) of ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate were determined in twelve n-donor solvents and compared with the known values of PMVs of lithium and magnesium perchlorates in the same solvents. The proportionality in the change in the molar volumes of these salts and the predominant contribution of anion solvation were observed. The values of PMVs of the 1-butyl-3-methylimidazolium cation were calculated.