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Butterfly M2IIIEr2 (MIII = Fe and Al) SMMs: Synthesis, Characterization, and Magnetic Properties
ACS Omega ( IF 3.7 ) Pub Date : 2018-06-13 00:00:00 , DOI: 10.1021/acsomega.8b00550
Yan Peng 1, 2 , Valeriu Mereacre 1 , Christopher E. Anson 1 , Annie K. Powell 1, 2
Affiliation  

The reaction of N-(2-pyridylmethyl)iminodiethanol (H2L, pmide), FeCl2·4H2O or AlCl3·6H2O with ErCl3·6H2O and p-Me-PhCO2H in the ratio of 2:1:1:4 in the presence of Et3N in MeOH and MeCN yielded compounds [Fe2Er23-OH)2(pmide)2(p-Me-PhCO2)6]·2MeCN (1) and [Al2Er23-OH)2(pmide)2(p-Me-PhCO2)6]·2MeCN (2). These two complexes are isostructural, possessing a planar butterfly motif with the ErIII ions in the wingtip positions. Both compounds show single molecule magnet (SMM) behavior. For the [Al2Er2] compound, the slow relaxation of the magnetization under zero applied direct current (dc) field does not show maxima, but the relaxation processes could be analyzed using an applied dc field of 1000 Oe. In-depth alternating current measurements under different dc fields on the [Fe2Er2] compound reveals that the Fe–Fe and Fe–Er interactions speed up the relaxation and decrease the energy barrier height of the SMM in comparison with the [Al2Er2] case.

中文翻译:

蝴蝶M 2 III Er 2(M III = Fe和Al)SMM:合成,表征和磁性能

的反应ñ - (2-吡啶基甲基)亚氨基二乙醇(H 2 L,pmide)的FeCl 2 ·4H 2 O或的AlCl 3 ·6H 2 O运用ErCl 3 ·6H 2 O和p -Me-PhCO 2中的H的比率的2:1:1:4中的的Et存在下3中的N的MeOH和MeCN,得到化合物的[Fe 22(μ 3 -OH)2(pmide)2p -Me-PhCO 26 ]·2MeCN(1)和[Al 2 Er 2(μ3 -OH)2(pmide)2p -Me-PhCO 26 ]·2MeCN(2)。这两个复合物是同构的,具有平面的蝶形图案,且在翼尖位置带有Er III离子。两种化合物均表现出单分子磁体(SMM)行为。对于[Al 2 Er 2 ]化合物,在零施加直流(dc)磁场下磁化的缓慢弛豫没有显示最大值,但是可以使用1000 Oe的施加dc场分析弛豫过程。[Fe 2 Er 2]化合物显示,与[Al 2 Er 2 ]情况相比,Fe-Fe和Fe-Er相互作用加快了SMM的弛豫并降低了其能垒高度。
更新日期:2018-06-13
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