Iron(III) Removal from Aluminum Sulfate Solutions by Sorption

Russian Journal of Applied Chemistry - Sorption of aluminum(III) and iron(III) from their individual solutions and of iron(III) impurity from Al2(SO4)3 solutions on macroporous resins, Puromet...     

Triterpenic Acid Amides as Potential Inhibitors of the SARS-CoV-2 Main Protease

Although the incidence and mortality of SARS-CoV-2 infection has been declining during the pandemic, the problem related to designing novel antiviral drugs that could effectively resist viruses in the future remains relevant. As part of our continued search for chemical compounds that are capable of exerting an antiviral effect against the SARS-CoV-2 virus, we studied the ability of triterpenic acid amides to inhibit the SARS-CoV-2 main protease. Molecular modeling suggested that the compounds are able to bind to the active site of the main protease via non-covalent interactions. The FRET-based enzyme assay was used to reveal that compounds 1e and 1b can inhibit the SARS-CoV-2 main protease at micromolar concentrations.     

On the stability of shock waves in a continuous medium with a space charge

The stability of shock waves is discussed for a hydrodynamic model of motion of a continuous medium with a space electrical charge. The correctness of a mixed problem obtained by linearization of the hydrodynamic model and the equations of a strong discontinuity for electrohydrodynamic shock waves is proved. As is known, this indicates stability of this type of strong discontinuity in the model of a continuous medium considered. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 39, No. 2, pp. 29–39, March–April, 1998.     

Sorption Purification of Aqueous Ammonium Molybdate To Remove Tungsten Impurities with a Cation Exchanger Containing Pyrocatechol Functional Groups

The sorption of molybdenum(VI) and tungsten(VI) from weakly alkaline and neutral solutions with PK-S cation exchanger containing pyrocatechol functional groups was studied. The possibility of selective recovery of tungsten(VI) impurities from aqueous ammonium molybdate with PK-S resin was examined.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 3, 2005, pp. 425–427.Original Russian Text Copyright © 2005 by Blokhin, Kaloshina, Lyubman, Murashkin.     

Heterylimidazoles.

Condensation of 5-formy1-N,N'-dimethylbenzimidazolone with aromatic -diketones gave 2-(N,N'-dimethylbenzimidazolon-5-yl)-4,5-diarylimidazoles, which are easily oxidized in alkaline media to imidazolyl free radicals. Some of the investigated heterylimidazoles also form radicals when chloroform solutions of them are irradiated. It is shown that the synthesized compounds are inhibitors of the thermal oxidative destruction of polyethylene oxide.See [1] for communication V.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 519–521, April, 1978.     

Heterylimidazoles

2-Quinolyl- or 2-(9-acridinyl)-4,5-diarylimidazoles were obtained by the condensation of benzil or p,p-dimethylbenzil with heterocyclic aldehydes in acetic acid in the presence of ammonium acetateTranslated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 681–682, May, 1972.     

Physicochemical properties, structure, and conformations of 1-Butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [C4mim]NTf2 ionic liquid

Thermodynamic properties of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C4mim]NTf2) ionic liquid have been studied by adiabatic calorimetry in the temperature range of 5 to 370 K. This compound has been found to form crystal, liquid, and glass. The temperature and enthalpy of fusion for [C(4)mim]NTf(2) have been determined to be T(fus) = 270.22 +/- 0.02 K and Delta(fus)H = 23.78 +/- 0.04 kJ.mol(-1), respectively. The heat capacity of crystalline [C(4)mim]NTf(2) in the T range of 205 to 255 K may vary by a few percent, subject to the procedure of the crystal preparation. The glass transition temperature for [C(4)mim]NTf(2) has been found to be T(g) = 181.5 +/- 0.1 K. On the basis of the results of DFT quantum chemical calculations, the experimental vibrational spectra, and the available literature data, thermodynamic properties of [C(4)mim]NTf(2) in the ideal-gas state have been calculated by the statistical thermodynamic methods. The entropy values for the gaseous compound obtained from the experimental data and the calculations are in satisfactory agreement.     

Low-temperature heat capacity of hydrophilic ionic liquids [BMIM][CF3COO] and [BMIM][CH3COO] and a correlation scheme for estimation of heat capacity of ionic liquids

Heat capacity for 1-butyl-3-methylimidazolium trifluoroacetate [bmim][CF₃COO] and acetate [bmim][CH₃COO] in the temperature range of (5 to 370) K has been measured by adiabatic calorimetry. Temperatures and enthalpies of phase transitions in [bmim][CF₃COO] have been determined. Thermodynamic functions for the compounds in the condensed state have been calculated. Physicochemical properties for the studied ionic liquids and alkali acetate salts have been compared. The correlation scheme for estimation of C_p of ionic liquids in a range of (190 to 370) K has been developed.     

Advances in the studies of bisphosphorylated dihydric phenols

The data on the synthesis, structure, and chemical properties of bisphosphorylated dihydric phenols are summarized. All the currently known methods for the synthesis of the systems in question are shown. Specific features of their structure, chemical and complexation properties, as well as areas of application of these compounds were analyzed.