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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Packing Structure Effects on the Slow Magnetic Relaxation Pathways of Dysprosium (III) Complexes
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Packing Structure Effects on the Slow Magnetic Relaxation Pathways of Dysprosium (III) Complexes

机译:包装结构对镝(III)复合物的缓慢磁性松弛途径

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摘要

Three complexes, [Dy{5-(5-methylthiophen-2-yl)-2,2'-bipyridine}( hfac)(3)] (6), [Dy{5-(4-bromo-5-methylthiophen-2yl)-2,2'- bipyridine}(hfac)(3)] (7) and [Dy{5-(4-ethynyl-5-methylthio-phen-2-yl)-2,2'- bipyridine}(hfac)(3)] (8) (hfac = hexafluoroacetylacetate), were synthesized to investigate the effects of substituents on the ligand far from the metal ion on the magnetic properties of the dysprosium ion. 7 crystallized in two polymorphs (P2(1)/n for 7a and P2(1)/a for 7b), whereas 6 and 8 crystallized in one polymorph (P2(1)/n and P2(1)/a, respectively). All of the complexes have columnar structures, and in 6 and 7a, there are pi-pi stacking interactions between neighboring aromatic rings in contrast to compounds 7b and 8, which do not show such interactions. Every complex underwent slow magnetic relaxation with a single relaxation time, except for complex 7a, for which there were two relaxation times. In order to clarify the role of distal substitution and crystal packing, the magnetic properties were studied in solution, where all of the complexes show single relaxation times.
机译:三分之三,[Dy {5-(5-甲基噻吩-2-基)-2,2'-Bi0吡啶}(HFAC)(3)](6),[Dy {5-(4-溴-5-甲基噻吩 - 2基)-2,2'-硼啶}(HFAC)(3)](7)和[Dy {5-(4-乙炔基-5-甲基-Phen-2-Y1)-2,2'- BiPyridine}( HFAC)(3)](8)(HFAC =六氟乙酰乙酸酯)被合成,以研究取代基对远离金属离子对镝离子的磁性的影响的影响。 7以两种多晶型物(7A(1)/ N和7B的P2(1)/ n结晶),而分别在一种多晶型物中结晶的6和8分别在一个多晶型物(P2(1)/ N和P2(1)/ A)中结晶。所有复合物都具有柱状结构,并且在6和7a中,与化合物7b和8形成相邻的芳环之间存在pi-pi堆叠相互作用,与化合物7b和8不显示这种相互作用。每一个复杂的慢磁性放松,除了复合物7a,除了复合物7a,其中有两个放松时间。为了澄清远端取代和晶体包装的作用,在溶液中研究了磁性,其中所有复合物都显示出单一的弛豫时间。

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    Tohoku Univ Grad Sch Sci Dept Chem Aoba Ku 6-3 Aramaki Aza Aoba Sendai Miyagi 9808578 Japan;

    Tohoku Univ Grad Sch Sci Dept Chem Aoba Ku 6-3 Aramaki Aza Aoba Sendai Miyagi 9808578 Japan;

    Tohoku Univ Grad Sch Sci Dept Chem Aoba Ku 6-3 Aramaki Aza Aoba Sendai Miyagi 9808578 Japan;

    Tohoku Univ Grad Sch Sci Dept Chem Aoba Ku 6-3 Aramaki Aza Aoba Sendai Miyagi 9808578 Japan;

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