CHEMICAL PROBLEMS

Abstract The effects of complexing ligands -ethylenediaminetetraacetic acid disodium salt (EDTA), nitrilotriacetic acid trisodium salt (NTA) and their mixtures on the composition and morphology of Mn-Ni and Mn-Cu-Ni alloys obtained by electrodeposition were studied. It found that high values of stability constants of conventionally electropositive potential of the nickel ion complexes are not sufficient for […]

Abstract Results of structural studies and ionic conductivity of solid solutions (ZrO2)1- x(Sc2O3)x (x = 0.08 – 0.10) doped with 1 mol.% Y2O3, Yb2O3иСeO2 are presented. Crystals were grown by directional crystallization of melt in cold container. Studies of phase compositions were carried out by means of X-ray diffraction and Raman spectroscopy. Transport properties were […]

Abstract The paper considers new approaches to the preparation of structured catalysts and peculiarities of the processes for the production of hydrogen-rich gas from hydrocarbons and dimethyl ether for fuel cell feeding applications. The results of the studies of structured catalyst for CO removal from reformate by selective methanation are presented.

Abstract The one-step interaction of substituted ylidenecyanoacetamides (or ylidenema- lononitriles), malononitrile and 1,3-diaminopropane was carried out in methanol environment at room temperature and it established the formation of new substituted dihydropyridopyrimidine deri- vatives. It also revealed that under the same conditions through the use of one-step three- component reaction of pyridylidenecyanoacetamide (or pyridylidenemalononitrile), 2-chloro-5- nitrobenzylidenecyanoacetamide […]

Abstract Defective metal string complex with one nickel(II) metal absent in center [Ni8(μ8-N9- 2pz)4Cl2](PF6)2 (2) was obtained on the basis a pyrazine and naphthyridine-containing triamino ligand N2-(pyrazin-2-yl)-N7-(7-(pyrazin-2-ylamino)-1, 8-naphthyridin-2-yl)-1, 8-naphthyridine- 2,7-diamine (H3N9-2pz) (1). The small J value (J = –2.96 cm–1) suggests quite a weak magnetic interaction throughout the molecule of complex 2. The weak magnetic […]

Abstract The paper explores questions of structural-chemical aspects of peritectic compounds formation in the Ga2S3-Ln2O2S (where Ln-La,Nd) system. It found that these reactions proceed due to inheriting structural peculiarities of the peritectic compound by the solid product of reaction. Specifically, the structure of peritectic compounds and solid products of their decomposition are interrelated by means […]

Abstract The phase and chemical equilibria in the Fe – Si system at 298 K were considered. The comparison between the available thermodynamic information on the solid solubility of silicon in bcc-iron at low temperatures was performed with and without consideration of the α-phase long distance ordering. The standard Gibbs energy of formation for non-stoichiometric […]

Abstract Information about methods of preparation, structure and physical-chemical properties of nanostructured materials based on lithium and sodium titanates was analyzed and summarized. The functional nanostructured composite materials based on sodium and lithium titanates to produce an anode material with high capacity and working stable potential in the course of cycling with optimal electronic and […]