Unusual molecular structure of (C=O→Si←O′=C′) bis(2-methyl-4-pyrone-3-oxy)difluoro(λ6)siliconium

X-ray diffraction is used to determine the crystal and molecular structure of spirocyclic (C=O→Si←O′=C′) bis(2-methyl-4-pyrone-3-oxy)difluoro(λ⁶)siliconium containing a hypervalent silicon atom and the previously unknown F₂SiO₄ coordination center. The coordination polyhedron of the silicon atom is a slightly distorted octahedron.     

Unusual lability of intramolecular coordination bond O→Si <Emphasis Type="Italic">N</Emphasis>-(trifluorosilylmethyl)succinimide

According to IR spectroscopy data and ab initio quantum chemical computations, a novel representative of intracomplex organosilicon compounds — N-(trifluorosilylmethyl)succinimide (I) possesses an anomalously high sensitivity to medium effects. Coordination bond O→Si of the compound I is strong in the solid phase and polar medium, and weak in its isolated molecules. Geometric parameters calculated for the molecule I in polar medium correspond to X-ray diffraction data.     

Isolation of frutitsin from the seeds ofAmorpha fruticosa

The conditions for the isolation and purification of frutitsin by various solvents and mixture of solvents have been studied. The proposed method for the isolation of frutitsin permits the yield of the substance to be increased.     

Investigation of inelastic interactions of 400 GeV protons with emulsion nuclei

The basic experimental characteristics of incoherent interactions of 400 GeV protons on emulsion nuclei, such as the multiplicity of charged secondaries, one-particle distributions and two-particle correlations, are reported and discussed in details. They are compared with the results of other experiments on hadron-nucleus interactions at lower energies. We have shown from both the quantitative and qualitative comparison of the data presented with predictions of various model approaches to nuclear production, that most of them cannot explain the complete set of experimental observations.An analysis of the experimental data presented gives strong support to the idea that the production mechanism in high-energy hadron-nucleus interactions has two or multi-component character.     

Specific features of sorption of bovine serum albumin on hydroxyapatite doped with zinc ions,and the possibilities of its use as an intermediate binding protein for heterocyclic ligands

Russian Chemical Bulletin - In order to characterize hydroxyapatite (HAP) as a possible carrier of medicinal drugs and radionuclides, the possibility of using HAP modified with zinc ions (HAP-Zn)...