Abstract
AbstractFive dinuclear lanthanide complexes [Ln2L2(NO3)2(OAc)4]·2CH3CN [Ln = Gd (1), Tb (2), Dy (3), Ho (4), and Er (5)] [L = 2‐((2‐pyridinylmethylene)hydrazine)ethanol] were synthesized from the reactions of Ln(NO3)3·6H2O with L and CH3COOH in the presence of triethylamine. Their crystal structures were determined. They show similar dinuclear cores with the two lanthanide ions bridged by four acetate ligands in the μ2‐η1:η2 and μ2‐η1:η1 bridging modes. Each LnIII ion in complexes 1–5 is further chelated by one L ligand and one nitrate ion, leading to the formation of a nine‐coordinated mono‐capped square antiprism arrangement. The dinuclear molecules in 1–5 are consolidated by hydrogen bonds and π···π stacking interactions to build a two‐dimensional sheet. Their magnetic properties were investigated. It revealed antiferromagnetic interactions between the GdIII ions in 1 and ferromagnetic interactions between the TbIII ions in 2. The profiles of χmT vs. T curves of 3–5 reveal that the magnetic properties of 3–5 are probably dominated by the thermal depopulation of the Stark sublevels of LnIII ions.
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