p-tert-butylcalix[4]arenes containing azacrown ether substituents at the lower rim as potential polytopic receptors
作者:E. A. Alekseeva、S. S. Basok、A. V. Mazepa、A. P. Luk’yanenko、O. V. Snurnikova、A. I. Gren’
DOI:10.1134/s1070363213090181
日期:2013.9
A series of disubstituted p-tert-butylcalix[4]arenes with N-methoxycarbonylmonoazacrown ether and N-ethoxymonoazacrown ether residues at the lower rim has been prepared via the reaction of di(carboxymethoxy)-p-tert-butylcalix[4]arene with azacrown ethers and subsequent reduction of the resulting amide derivatives. Using UV titration and H-1 NMR spectroscopy we have demonstrated the ability of the calixarene with two N-carbonylmonoaza-18-crown-6-ether substituents to form the 1:3 complexes with K+ and Na+ and the 1:2 complexes with Cs+, Sr2+, Cu2+, and Zn2+. The calixarene with two fragments of N-ethoxymonoazo-18-crown ether has formed binuclear complexes with alkali metals cations and mononuclear complexes with transition metals cations.