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- Title
Butterfly-Shaped Pentanuclear Dysprosium Single-Molecule Magnets.
- Authors
Tian, Haiquan; Zhao, Lang; Lin, Haifeng; Tang, Jinkui; Li, Guangshe
- Abstract
Two new 'butterfly-shaped' pentanuclear dysprosium(III) clusters, [Dy5(μ3-OH)3(opch)6(H2O)3] ⋅3 MeOH ⋅ 9 H2O ( 1) and [Dy5(μ3-OH)3(Hopch)2(opch)4(MeOH)(H2O)2] ⋅(ClO4)2 ⋅ 6 MeOH ⋅4 H2O ( 2), which were based on the heterodonor-chelating ligand o-vanillin pyrazine acylhydrazone (H2opch), have been successfully synthesized by applying different reaction conditions. Single-crystal X-ray diffraction analysis revealed that the butterfly-shaped cores in both compounds were comparable. However, their magnetic properties were drastically different. Indeed, compound 1 showed dual slow-relaxation processes with a transition between them that corresponded to energy gaps (Δ) of 8.1 and 37.9 K and pre-exponential factors ( τ0) of 1.7×10−5 and 9.7×10−8 s for the low- and high-temperature domains, respectively, whilst only a single relaxation process was noted for compound 2 (Δ=197 K, τ0=3.2×10−9 s). These significant disparities are most likely due to the versatile coordination of the H2opch ligands with particular keto-enol tautomerism, which alters the strength of the local crystal field and, hence, the nature or direction of the easy axes of anisotropic dysprosium ions.
- Subjects
DYSPROSIUM; SINGLE molecule magnets; PYRAZINES; SINGLE crystals; X-ray diffraction; BAND gaps; TAUTOMERISM
- Publication
Chemistry - A European Journal, 2013, Vol 19, Issue 39, p13235
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201301313