Cation-dependent structural diversity of zinc(II), calcium(II) mono- andbinuclear complexes of aryl-imidazo-1,10-phenanthroline derivativesстатья
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Аннотация:The syntheses of azacrown-containing aryl-imidazophenanthroline by reaction of 1,10-phenanthroline-
5,6-dion with 4-(1.4.7.10-tetraoxa-13-azacyclopentadecan-13-yl)benzaldehyde producing the ligand 2
in high yield is described. Examination of their Zn(II), Ca(II) and mixed complexes by UV/Vis and NMR
spectroscopy suggests electronic communication between the two metal centers of ligand 2. Stability
constants, determined by spectrophotometric titration, indicate that the Zn(II) possesses higher affinity
toward phenanthroline residue than Ca(II) and does not bind with azacrown-ether residue. This selectivity
allows to prepare a mixed Zn(II)/Ca(II) complex.