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• W2092014254 abstract "Abstract The reactions between the [Ln(tta) 3 ]⋅2 H 2 O precursors (tta − =2‐thenoyltrifluoroacetonate anion) and the tetrathiafulvalene‐3‐pyridine‐ N ‐oxide ligands (L 1 ) lead to dinuclear complexes of formula [{Ln(tta) 3 (L 1 )} 2 ]⋅ x CH 2 Cl 2 ( x =0.5 for Ln=Dy III ( 1 ) and x =0 for Ln=Gd III ( 2 )). The crystal structure reveals that two {Ln(tta) 3 } moieties are bridged by two donors through the nitroxide groups. The Dy III centre adopts a distorted square antiprismatic oxygenated polyhedron structure. The antiferromagnetic nature of the exchange interaction between the two Dy III ions has been determined by two methods: 1) an empirical method using the [Dy(hfac) 3 (L 2 ) 2 ] mononuclear complex as a model ( 3 ) (hfac − =1,1,1,5,5,5‐hexafluoroacetylacetonate anion, L 2 =tetrathiafulvaleneamido‐2‐pyridine‐ N ‐oxide ligand), and 2) assuming an Ising model for the Dy III ion giving an exchange energy of −2.30 cm −1 , g =19.2 in the temperature range of 2–10 K. The antiferromagnetic interactions have been confirmed by a quantitative determination of J for the isotropic Gd III derivative ( J =−0.031 cm −1 , g =2.003). Compound 1 displays a slow magnetisation relaxation without applied external magnetic fields. Alternating current susceptibility shows a thermally activated behaviour with pre‐exponential factors of 5.48(4)×10 −7 s and an energy barrier of 87(1) K. The application of an external field of 1.6 kOe compensates the antiferromagnetic interactions and opens a new quantum tunnelling path." @default.
• W2092014254 created "2016-06-24" @default.
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• W2092014254 date "2011-08-04" @default.
• W2092014254 modified "2023-10-18" @default.
• W2092014254 title "Single-Molecule Magnet Behaviour in a Tetrathiafulvalene-Based Electroactive Antiferromagnetically Coupled Dinuclear Dysprosium(III) Complex" @default.
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• W2092014254 doi "https://doi.org/10.1002/chem.201100869" @default.
• W2092014254 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21818794" @default.
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