| 基于多齿席夫碱的双核Dy(Ⅲ)配合物的合成、晶体结构和磁性 |
| Synthesis, Crystal Structure and Magnetic Properties of Dinuclear Dy(Ⅲ) Complex Based on Multidentate Schiff Base |
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| 摘要: 以 2-肟基丙烷酰肼缩 2-羟基萘甲醛席夫碱(H2L)为主配体，乙酰丙酮(Hacac)为辅配体，构筑了一例双核稀土镝配合物[Dy2(L)2(acac)2(CH3CH2OH)2] (1)。通过单晶 X 射线衍射、元素分析以及磁性测试对其结构和磁行为进行了表征。结构分析表明，配合物1是一个结构呈中心对称的双核镝(Ⅲ)配合物，其结构的最小不对称单元包含1个Dy(Ⅲ)离子，1个L2-配体，1个acac-配体和1个乙醇分子；中心Dy(Ⅲ)离子为八配位，其配位构型为扭曲的双帽三棱柱。磁性研究结果表明，配合物1中Dy(Ⅲ)离子间存在弱的反铁磁相互作用，且该配合物表现出了慢磁弛豫行为，其磁弛豫有效能垒为14.52 K，指前因子τ0为7.58×10-6 s。 |
| 关键词: 双核镝(Ⅲ)配合物 八配位 双帽三棱柱 反铁磁作用 慢磁弛豫行为 |
| 基金项目: 凯里学院自然科学研究博士专项课题(No.BS201418)资助 |
| Abstract: A new Dy2 complex [Dy2(L)2(acac)2(CH3CH2OH)2] (1) has been synthesized based on a multidentate Schiff base H2L (H2L=N'-(2-hydroxynaphthalen-1-ylmethylene)-2-(hydroxyimino)propanehydrazide) and β-diketone coligand Hacac (Hacac=acetylacetone). Complex 1 was characterized by single-crystal X-ray diffraction, elemental analysis and further investigated by magnetic measurements. Structural analysis reveals that complex 1 is a centro-symmetric dinuclear dysprosium complex and the asymmetric unit contains a Dy(Ⅲ) ion, one L2- ligand, one acac- coligand, and an ethanol molecule. Each of the Dy(Ⅲ) centers is eight-coordinate and adopts a distorted bicapped trigonal-prismatic coordination geometry. Magnetic studies suggest the existence of weak antiferromagnetic interactions between the Dy(Ⅲ) ions in 1. In addition, the slow magnetic relaxation behaviors are observed in 1 with the magnetic energy barrier ΔE/kB=14.52 K and the pre-exponential factor τ0=7.58×10-6 s. |
| Keywords: dinulcear Dy(Ⅲ) complex eight-coordinate bicapped trigonal-prismatic antiferromagnetic interaction slow magnetic relaxation behavior |
| 投稿时间：2021-07-24 修订日期：2021-11-20 |
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| 王勤,刘媛媛,牛丽,闫静,侯银玲.基于多齿席夫碱的双核Dy(Ⅲ)配合物的合成、晶体结构和磁性[J].无机化学学报,2022,38(3):535-541. |
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