Synthesis, Structures, and Magnetic Properties of Three Fluoride-Bridged Lanthanide Compounds: Effect of Bridging Fluoride Ions on Magnetic Behaviors

State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.
Inorganic Chemistry (Impact Factor: 4.76). 07/2012; 51(14):7529-36. DOI: 10.1021/ic300125y
Source: PubMed


A family of fluoride-bridged lanthanide compounds, [Dy(III)F(oda)(H(2)O)(3)] (1, oda = oxidiacetate) and [Ln(III)(2)F(2)(oda)(2)(H(2)O)(2)] (Ln = Tb(2) and Dy(3)), was synthesized and characterized. To investigate the effects of bridging ligands on magnetic behaviors, two hydroxyl-bridged complexes of formulas [Ln(III)(2)(OH)(2)(oda)(2)(H(2)O)(4)] (Ln = Tb(4) and Dy(5)) were also synthesized. Magnetic measurements show that the magnetic behaviors of the compounds are obviously distinct. Compounds 1, 2, and 3 show ferromagnetic interactions, while only antiferromagnetic interactions are observed in compounds 4 and 5. Among these compounds, 1 and 3 show frequency-dependent ac-susceptibility indicative of slow magnetic relaxation. Because the structures of Dy(2) cores are very similar in compounds 3 and 5, it may be inferred that the differences of bridging ligands are mainly responsible for the distinct magnetic exchange interactions and relaxation dynamics.

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