Modulating magnetic properties of a macrocyclic dinuclear copperII complex: Influence of counteranions on the crystal structureReport as inadecuate




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A group of dinuclear copperII compounds containing the macrocyclic complexes Cu2L2+ LH2 = C24H2sN4O4: a ligand derived from the condensation of 4-methyl-2,6-diformylphenol with 1,3-diamine-2-propanol have been prepared, and characterised both structurally and magnetically. The compounds, containing different counterions, were formulated as: Cu2LCI2 . 2H2O 1; Cu2Lmu2-acetateacetate 2a, Cu2Lacetate2H2O2 . 6H2O 2b and Cu2LH2O22SO4H . 2H2O 3. The copperII ions present a square pyramidal geometry in three of the reported moieties, with axially coordinated halogens in 1, syn-syn acetate ligands in 2b, and water molecules in 3. Compound 2a is different in that the cations display distorted octahedral environments, with aqua and acetate oxygens at the apices. Compound 2b which co-crystallised with 2a, presents a folded structure of the macrocyclic ligand due to the presence of the bridging acetate molecule. There is a significant dependence of the bulk magnetic properties of the compounds studied with the nature of the counteranions used, evidenced in the large -2J span observed throughout the series 306 to > 1015 cm-1. This might be due to the structural differences, both in molecular geometries as well as in crystal packing, introduced by the different counterions.



Author: Venegas Yazigi, Diego; - Cortés, Susana; - Paredes García, Verónica; - Peña, Octavio; - Ibáñez, Andrés; - Baggio, Ricardo;

Source: http://repositorio.uchile.cl/



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