Журнал "Макрогетероциклы"

New 4′-(1-hydroxy-9,10-anthraquinone-9-imino)benzo-15-crown-5 ether derivatives containing a phenoxy group at the position 2 or 4 of the anthraquinone moiety were synthesized photochemically. The complexing properties of these compounds in acetonitrile were studied by spectrophotometry. Two analogous derivatives, one of which has no substituents in positions 2 and 4, and the other one containsbenzoylamino group in position 2, were used in this study as the reference ligands. It was demonstrated that the synthesized dyes are capable of binding the Sr²⁺ and Ba²⁺ ions to form 2:1 (ligand–metal) sandwich-type complexes that exhibit higher stability constants than the corresponding 1:1 complexes. The molecular structures of the biligand complexes with Ba²⁺ in solution were studied by dispersion-corrected density functional theory calculations.