Химия

Currently, the synthesis of oxygen-containing heterocyclic compounds containing a fused benzene ring system with a pyrone cycle, represented by 4-hydroxycoumarin (4-hydroxy-2H-chromen-2-one), is of great importance due to their broad spectrum of biological activity. We found it interesting to conduct reactions of 1,5-dicarbonyl compounds based on 4-hydroxycoumarin with N-nucleophiles, both from a fundamental point of view and from the perspective of the practical application of the resulting products.

The interaction of cationic halcogenpyrilocyanic dyes, 2,6-diphenil-4-(4-dimethylaminostyryl)pyrylium and -thapyrylium chlorides, with inorganic ions in aqueous solutions was studied. The spectrophotometric characteristics and stability constants of the resulting ion pairs were determined.

The work was aimed at establishing new correlations between some known energetic characteristics of several materials and their performance.

A melange gel technology of obtaining xerogels of silic acid modified with organic reactants has been designed. The technology is based on the extraction of micellar phase of non-ionic surfactants with organic reactants and its deposition on the surface of xerogels.

The article is dedicated to systematization and structuring of content of college inorganic chemistry course. Author introduced comprehend scheme for studying the facts of inorganic chemistry.

A quantum-chemical calculation of characteristics of aliphatic alcohols and water molecules as well as their compounds is carried out. It's shown that these substances are the strongly associated liquids of definite structure. The structure of water-alcohol associates with different ratios of components is considered.

Phase equilibria and critical phenomena in the ternary sodium nitrate – water – acetonitrile system, where the constituent binary liquid system is characterized by phase separation with an upper critical solution temperature, were studied by means of the visual-polymermal method within –5…+80°C.