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Information × Registration Number 0223U005621, 0121U100478 , R & D reports Title Synthesis of new bis(crown ethers) and calixarenes with fragments of benzo- and benzoazacrown ethers and study of the influence on their complexing properties of the nature of aromatic fragments, heteroatoms and functional groups in the linking chains popup.stage_title Head Kirichenko Tetiana I., Доктор хімічних наук Registration Date 26-12-2023 Organization Physico-Chemical Institute O. Bogatsky National Academy of Sciences of Ukraine popup.description2 The object of the research – the synthesis, structure and complexing properties of bis(benzoazacrown-ethers), with the substituents of various nature at the Nitrogen atoms in the flexible chaines. The complexing ability of p-tert-butylcalix[4]arene derivatives with benzo-(dibenzo-) and benzoazacrown-ether substituents. The purpose of the work – the synthesis of new bis(benzoazacrown-ethers), in which the flexible chain includes Nitrogen atoms with substituents of different nature. Study of the complexation of the obtained macrocycles with metal cations. Establishing the dependence of the complexing properties of the synthesized calixarene derivatives, namely stability, selectivity and stoichiometry of the complexes, on the nature and number of crown-ether substituents in the macrocycle molecule. On the base of substituted iminodiacetic acids a bis(benzoazacrown-ether) with an unsubstituted Nitrogen atom in the flexible chain was obtained. By alkylation with a various reagents, new bis(benzoazacrown-ethers) containing the substituted Nitrogen atoms are included in the flexible chain were synthesized. The complexation of the obtained macrocycles with cations of alkali and alkaline earth metals were studied. For a compound with an unsubstituted Nitrogen atom with the largest cesium cation, the appearance of a complex with a composition of 2:1 (L:M) with a very high value of the stability constant is observed. The complexing properties of the obtained calixarenes toward cations of s- and d-elements were studied using the methods of spectrophotometric titration and extraction in the liquid-liquid system. Some compounds are capable of effectively removing the lithium cations (89.79%), sodium cations (97%) and iron(III), copper, nickel and cobalt cations (> 35%) from the water medium. The molecular clip based on dibenzo-18-crown-6 effectively interacts with cations of alkali and alkaline earth metals. Product Description popup.authors Alekseeva Olena O. Basok Stepan S. Kirichenko Tatiana I. Kulygina Katerina Yu. Lutsyuk Anatoliy F. Mazepa Oleksandr V Rakipov Ildar M. Sydorov Vyacheslav V. popup.nrat_date 2023-12-26 Close