Synthesis of metal complexes with a novel ethyldioxolane pendant-arm hexaazamacrocyclic ligand |
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| Authors: | Cristina Núñez Rufina Bastida Alejandro Macías Anxela Aldrey Laura Valencia |
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| Institution: | 1. Departamento de Química Inorgánica, Facultad de Química, Universidad de Santiago de Compostela, Avda. de las Ciencias s/n 15782, Santiago de Compostela, Spain;2. Departamento de Química Inorgánica, Facultad de Química, Universidad de Vigo, 36310 Vigo, Pontevedra, Spain |
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| Abstract: | 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. |
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| Keywords: | Macrocyclic ligand X-ray crystal structures Metal complexes π π-Stacking Pendant-arm |
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