多齿席夫碱配体构筑的Ln2配合物的晶体结构及磁性
Crystal Structures and Magnetic Properties of Ln2 Complexes Based on a Polydentate Schiff Base Ligand
作者单位E-mail
高晓丽 太原师范学院化学系, 晋中 030619  
雷文婷 太原师范学院化学系, 晋中 030619  
张清芳 太原师范学院化学系, 晋中 030619  
周宇 太原师范学院化学系, 晋中 030619  
康晓敏 内蒙古大学化学化工学院, 呼和浩特 010021 kangxm2020@163.com 
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-1T=2.0 K,ΔH=70 kOe);配合物3表现出了慢磁驰豫行为。
关键词: Ln2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 Ln2 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: Ln2 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
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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Ln2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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