Synthesis of metal complexes with a novel ethyldioxolane pendant-arm hexaazamacrocyclic ligand

The coordination capability of a pendant-arm azamacrocyclic ligand L with four ethyldioxolane pendant groups towards transition, post-transition and lanthanide metal ions was achieved. In all cases, complexes with a 2:1 metal:ligand molar ratio were obtained. The complexes were characterized by elemental analysis, MS-FAB, IR, conductivity measurements, 1H and 13C NMR spectroscopy. Crystal structures of [CoL][CoBr0.5(NO3)3.5] and [(H2O)H2L][Nd(NO3)4(H2O)3]NO3·3.5H2O have been determined. The [CoL]2+ cation contains the Co(II) ion endomacrocyclicly coordinated in a distorted octahedral geometry with a N6 core. The Nd(III) complex presents a mononuclear exomacrocyclic structure with an 11 coordination environment. π,π-Stacking interactions have been observed between the pyridine rings of the protonated ligand [(H2O)H2L]2+, and the [Nd(NO3)4(H2O)3]2− anion.

The coordination capability of a pendant-arm azamacrocyclic ligand L with four ethyldioxolane pendant groups towards transition, post-transition and lanthanide metal ions was achieved. In all cases, complexes with a 2:1 metal:ligand molar ratio were obtained. The complexes were characterized by elemental analysis, MS-FAB, IR, conductivity measurements, 1H and 13C NMR spectroscopy. Crystal structures of [CoL][CoBr0.5(NO3)3.5] and [(H2O)H2L][Nd(NO3)4(H2O)3]NO3.3.5H2O have been determined.Figure optionsDownload as PowerPoint slide