Search academic texts

Information × Registration Number 0225U000308, (0124U000449) , R & D reports Title Synthesis of molecular clips based on p-tert-butylcalix[4]arenes and diaza- or diaminodibenzo-crown ethers as a central fragments, and bis(benzoazacrown ethers) with long flexible linking chains. Study of processes of formation of "guest-host" complexes of synthesized compounds with cations and organic substrates popup.stage_title Синтез молекулярних кліпс на основі вихідних п-трет-бутилкалікс[4]аренів, які містять карбокси- та аміногрупи, та діазакраун-етерів. Синтез біс(бензоазакраун-етерів) з довгими, гнучкими ланцюгами, які містять метиленові та поліоксиетеленові групи. Встановлення їхніх фізико-хімічних характеристик. Вивчення екстракційних та комплексоутворюючих властивостей отриманих сполук відносно катіонів металів різних груп. Head Kirichenko Tatiana I., Доктор хімічних наук Registration Date 09-01-2025 Organization Physico-Chemical Institute O. Bogatsky National Academy of Sciences of Ukraine popup.description1 Development of efficient methods for the synthesis of bis(benzoazacrown ethers) with long flexible linking chains and molecular clips containing two molecules of p-tert-butylcalix[4]arene derivatives attached to a molecules of diaza(dibenzo)crown ethers by different spacers groups. Determination of the extraction and complexing ability of the obtained compounds toward metal cations of s-, d- and f-elements and some multifunctional organic substrates. popup.description2  The object of the research – Synthesis and complexing properties of molecular clips based on diaza crown ethers as central moieties and p-tert-butylcalix[4]arenes containing carboxy and amino groups as side groups. Synthesis and complexation of bis(benzoaza crown ethers) with long, flexible chains. The purpose of the work – Development of approaches to the synthesis of bis(benzoazacrown ethers) with long, flexible chains. Synthesis of new molecular clips containing two molecules of p-tert-butylcalix[4]arene derivatives, which are attached to a molecule of diazacrown ethers using various spacer groups. Study of the complexing properties of the synthesized compounds towards metal ions. The patterns of complexation with cations of alkali, alkaline earth and transition metals of molecular clips with a diaza crown ether linker and two fragments of p-tert-butylcalix[4]arenes as side walls have been studied, depending on the size of the crown ether cycle and the nature of the spacer groups. It has been shown that changing the size of the crown ether ring does not lead to the expected changes in the complexing properties of molecular clips. The length of the spacer groups and the presence of oxygen and nitrogen heteroatoms in them also have a great influence on the composition and nature of the complexes formed. The composition and stability constants of the complexes formed have been determined. A method for the synthesis of bis(benzoazacrown ethers) with long flexible linking chains has been developed, based on the interaction of diglycidal ethers of aliphatic diols with benzoaza-15-crown-5 in boiling anhydrous ethanol for 8-10 hours. The obtained compounds form the most stable complexes with sodium cations among alkali metal cations. With this cation, in all cases, less stable complexes of the composition 1:2 are also formed. With alkaline earth cations, barium selectivity is observed with the formation of intramolecular sandwich complexes of the composition 1:1 Product Description popup.authors Alieksieieva Olena O. Basok Stepan S. Kyrychenko Tetiana I. Kulyhina Kateryna Yu. Lutsiuk Anatolii F. Mazepa Oleksandr V. Rakipov Ildar M. Sydorov Viacheslav V. popup.nrat_date 2025-01-09 Close