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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lin, Haifeng Tang, Jinkui Li, Guangshe Tian, Haiquan Zhao, Lang |
| Description | Author Affiliation: Tian H ( State Key Laboratory of Rare Earth, Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022 (P.R. China), Fax: (+86) 431 85262878) |
| Abstract | Two new “butterfly-shaped” pentanuclear dysprosium(III) clusters, $[Dy_{5}(μ_{3}-OH)_{3}(opch)_{6}(H_{2}O)_{3}]⋅3 MeOH⋅$ $9 H_{2}O$ (1) and $[Dy_{5}(μ_{3}-OH)_{3}(Hopch)_{2}(opch)_{4}(MeOH)(H_{2}O)_{2}]⋅(ClO_{4})_{2}⋅$ $6 MeOH⋅4 H_{2}O$ (2), which were based on the heterodonor-chelating ligand o-vanillin pyrazine acylhydrazone $(H_{2}opch),$ 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 $(τ_{0})$ 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, $τ_{0}=3.2×10^{−9} s).$ These significant disparities are most likely due to the versatile coordination of the $H_{2}opch$ 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. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 39 |
| Volume Number | 19 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2013-09-23 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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