1. Slow Magnetic Relaxation in a [Na2Dy4] Complex and Coexistence of Multiple Metal Rings.
- Author
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Yang, Hua, Zhang, Yi‐Quan, Sun, Lei, Li, Da‐Cheng, Zeng, Su‐Yuan, Li, Yun‐Wu, Yang, Yan, and Dou, Jian‐Min
- Subjects
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MAGNETIC relaxation , *SINGLE molecule magnets , *MAGNETIC measurements , *AB-initio calculations , *MAGNETIC moments , *YTTERBIUM , *RARE earth metals - Abstract
Three rare isostructural heterometallic complexes [Na2{Ln4(μ3‐OH)2(ppt)4(Hppt)2(OAc)2}(DMF)4] ⋅ xH2O (H2ppt=3‐(2‐hydroxyphenyl)‐5‐(pyrazin‐2‐yl)‐1,2,4‐triazole, x=2.5, Ln=Dy (1); x=2, Ln=Er (2); x=0, Ln=Yb (3)) have been obtained. The structural analysis displayed that two NaI and four LnIII ions were linked together through N−N groups and O atoms to form a metallmacrocycle with the connectivity pattern [Dy−O−Na−N−N−Dy−O]2. Such cases possess rare hexametallic ring, which further displays one tetrametallic and two trimetallic cyclic units. Magnetic measurements reveal single‐molecule magnet (SMM) behavior for 1 with the effective energy barrier of 51.6 K and pre‐exponential factor of 6.16×10−6 s deduced from frequency‐dependent magnetic susceptibilities. Ab initio calculations prove that the weak ferromagnetic coupling mainly originats from the dipolar interaction. The transversal magnetic moments in the ground Kramers could suppressed the quantum tunneling of magnetization. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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