EPR of copper(II) chloride complexes with diphosphine dioxides

Stepwise formation of copper(ll) chloride complexes with diphosphine dioxides has been studied using paramagnetic resonance. It was found that in complexes with a copper:ligand composition of 11 substituents have little effect on parameters of the anisotropic EPR spectra. The spectra of complexes with a metal:ligand composition of 12 are considerably more sensitive to the introduction of substituents; this is explained by sterically dependent differences in the structure of the complexes. The possibility of trisligand complexes being formed is evidently largely determined by the size of the groups on the phosphorus atoms.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 362–368, February, 1991.     

Heat capacity and thermodynamic functions of 2-methylbiphenyl and 3,3′-dimethylbiphenyl in the range of 6 to 372 K

The heat capacities of 2-methylbiphenyl and 3,3′-dimethylbiphenyl are measured by means of low-temperature adiabatic calorimetry in the temperature range of 6 to 372 K. The thermodynamic characteristics of fusion and the glass transition of the investigated compounds are determined. The saturation vapor pressure and enthalpy of vaporization of 3,3′-dimethylbiphenyl are determined according to the dynamic method based on the transfer of a substance vapor in a helium flow. The absolute entropies and changes in Gibbs energies of biphenyl derivatives are calculated from the data obtained in the condensed and ideal gas states. The contribution of the C_b-(C_b) group is determined using the Benson additive method for calculating the absolute entropies of biphenyl derivatives in the liquid state (where C_b is the carbon atom in a benzene ring).     

(Ga,Ge)-Analogue of Tourmaline: Crystal Structure and Composition

Crystallography Reports - Crystals of a (Ga,Ge)-analogue of tourmaline have been synthesized by hydrothermal method in the temperature range of 600–650°C under a pressure of 100 MPa. The...     

Cross section and transverse momentum of hadron interactions with air nuclei at primary cosmic ray energies of 0.3–5 PeV

The Tien Shan experimental data on hadrons with energies exceeding 0.5 TeV in extensive air showers (EAS) from primary cosmic rays with energies from 0.3 to 5 PeV are compared with the results of CORSIKA + QGSJET model simulations. Some conclusions are drawn on the increase of the cross section and transverse momentum in the hadron interactions with air atom nuclei from 0.1 TeV (accelerator with a fixed target) to 5 PeV (EAS) energies.     

Twofold reactivity of 1,2-disubstituted dihydro-n-heteroaromatic systems. 10. Synthesis and aromatization of ferrocene-containing hantzsch esters

1-Ferrocenylphenyl-4-aryl(furyl)-2,6-dimethyl-3,5-diethoxycarbonyl-1,4-dihydropyridines and 4-ferrocenyl-2,6-dimethyl-3,5-diethoxycarbonyl-1,4-dihydropyridines (Hantzsch esters) have been prepared, and their reactions with triphenylcarbenium and 1-oxo-2,2,6,6-tetramethyl-piperidinium perchlorate salts have been studied. Treatment with triphenylmethyl perchlorate results in oxidation of the ferrocenyl substituent to the ferrocenium cation, whereas treatment with the oxoammonium cation results in aromatization and the formation of salts containing a pyridinium cation and a neutral ferrocene ring. A 4-ferrocenyl-containing Hantzsch ester which was unsubstituted at the nitrogen atom constituted a single exception to this trend; it could be aromatized only upon treatment with sulfur.For Communication 9, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1094–1101, August, 1986.     

Use of chromatography-mass spectrometry to study the composition of pharmacopoeial types of medicinal plant raw material

The composition of the volatile fraction of extracts for pharmacopoeial types of medicinal plant raw materials was studied using chromatography-mass spectrometry to identify specific compounds characteristic of a specific plant. Forty pharmacopoeial types of medicinal plant raw material were analyzed. It is shown that 14 of them contain specific volatile compounds (markers) allowing unambiguous identification.     

Structuring in Interphase Layer of Extraction System

The results of a study of the rheological properties of the interphase layer formed when an aqueous phase containing HCl and PrCl₃ is brought in contact with a solution of an extracting agent (nonoxymethylphosphonic acid) in toluene at varied content of the components in the system are presented.