| 多齿席夫碱配体构筑的Ln2Ⅲ配合物的晶体结构及磁性 |
| Crystal Structures and Magnetic Properties of Ln2Ⅲ Complexes Based on a Polydentate Schiff Base Ligand |
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| 摘要: 使用多齿席夫碱配体，通过溶剂热法，设计与合成了3例新的稀土配合物[Ln2（L）2（acac）2（CH3OH）2]·2CH3OH（Ln=Sm（1）、Gd（2）、Ho（3），H2L=吡啶-2-羧酸-（1-甲基-3-氧代丁烯基）-酰肼），并对配合物1~3的结构与磁性质进行了系统的研究。单晶结构测试结果表明配合物1~3为同构，每个中心稀土Ln（Ⅲ）离子为八配位，其配位几何构型为扭曲的四方反棱柱；相邻的中心稀土Ln（Ⅲ）离子通过2个μ2-O连接形成了平行四边形的[Ln2O2]核心。磁性测试揭示配合物2具有磁制冷性质，其最大磁熵变（-ΔSmax）为31.9 J·K-1·kg-1（T=2.0 K，ΔH=70 kOe）；配合物3表现出了慢磁驰豫行为。 |
| 关键词: Ln2Ⅲ配合物 晶体结构 磁性 磁制冷性质 慢磁驰豫行为 |
| 基金项目: 国家自然科学基金（No.21671124）资助。 |
| Abstract: Three new Ln2Ⅲ complexes based on a polydentate Schiff base ligand, namely [Ln2(L)2(acac)2(CH3OH)2]·2CH3OH (Ln=Sm (1), Gd (2), Ho (3), H2L=pyridine-2-carboxylic acid (1-methyl-3-oxo-butylidene)-hydrazide, Hacac =acetylacetone), have been synthesized by using solvothermal method. The crystal structures and magnetic properties of these complexes have been systematically studied. The crystal structures measurement results reveal that complexes 1-3 are isostructural and each eight-coordinated Ln (Ⅲ) ion possesses a square antiprism geometry; the adjacent central rare earth Ln(Ⅲ) ions are connected by two μ2-O to form a parallelogram [Ln2O2] core. The magnetic study showed that complex 2 displayed significant magnetic refrigeration property with a larger magnetic entropy (-ΔSmax) of 31.9 J·K-1·kg-1 at ΔH=70 kOe and T=2.0 K; while complex 3 shows slow magnetic relaxation behavior. |
| Keywords: Ln2Ⅲ complexes crystal structures magnetic properties magnetic refrigeration property slow magnetic relaxation behavior |
| 投稿时间：2021-06-04 修订日期：2021-10-23 |
| 摘要点击次数: 2090 |
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| 高晓丽,雷文婷,张清芳,周宇,康晓敏.多齿席夫碱配体构筑的Ln2Ⅲ配合物的晶体结构及磁性[J].无机化学学报,2022,38(1):145-152. |
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