| 两个Gd2配合物的晶体结构及磁制冷性质 |
| Crystal Structures and Magnetic Refrigeration Properties of Two Gd2 Complexes |
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| 摘要: 使用多齿席夫碱配体（H2L=pyridine-2-carboxylic acid （3，5-di-tert-butyl-2-hydroxy-benzylidene）-hydrazide）分别与Gd （dbm）3·2H2O （Hdbm=二苯甲酰基甲烷）及Gd （NO）3·6H2O反应，通过溶剂热法得到了2个新的Gd2配合物[Gd2（L）2（dbm）2（C2H5OH）2]（1）和[Gd2（L）2（HL）2（DMF）]·2CH3CN （2）（DMF=N，N-二甲基甲酰胺），并对其结构与磁性质进行了系统的研究。单晶结构分析表明配合物1中的每个中心Gd(Ⅲ)离子均为8配位，其配位几何构型为略微变形的三角十二面体，相邻的中心Gd(Ⅲ)离子通过2个μ2-O连接形成了平行四边形的Gd2O2核心；配合物2中的每个中心Gd(Ⅲ)离子均为9配位，其配位几何构型为扭曲的球形单帽四方反棱柱，相邻的中心Gd(Ⅲ)离子通过3个μ2-O连接形成了三角双锥形的Gd2O3核心。磁性测试表明配合物1和2具有磁制冷性质，其最大磁熵变（-ΔSm）分别为20.16 J·K-1·kg-1（T=2.0 K，ΔH=70 kOe）和17.14 J·K-1·kg-1（T=2.0 K，ΔH=70 kOe）。 |
| 关键词: Gd2配合物 晶体结构 磁性 磁制冷性质 |
| 基金项目: |
| Abstract: By utilizing a polydentate Schiff base ligand (H2L=pyridine-2-carboxylic acid (3,5-di-tert-butyl-2-hydroxy-benzylidene)-hydrazide), reacting with Gd(dbm)3·2H2O (Hdbm=dibenzoylmethane) and Gd(NO)3·6H2O, respectively; two new Gd2 complexes formulated as[Gd2(L)2(dbm)2(C2H5OH)2] (1) and[Gd2(L)2(HL)2(DMF)]·2CH3CN (2) (DMF=N, N-dimethylformamide) have been obtained by using solvothermal method. The crystal structures and magnetic properties of the two Gd2 complexes have been systematically studied. The crystal structures study reveals that each eightcoordinate Gd3+ ion in 1 possesses a distorted triangular dodecahedron; the two central Gd(Ⅲ) ions are connected by two μ2-O, resulting in a rhombic-shaped Gd2O2 core. However, for 2, each central Gd(Ⅲ) ion is nine-coordinate and their coordination configurations can be described as distorted spherical capped square antiprism, and the two central Gd(Ⅲ) ions are connected by three μ2-O forming a triangular biconical-shaped Gd2O3 core. Magnetic investigations showed that the two Gd2 complexes displayed magnetic refrigeration properties with the magnetic entropy (-ΔSm) of 20.16 J·K-1·kg-1 for 1 and 17.14 J·K-1·kg-1 for 2 at ΔH=70 kOe and T=2.0 K. |
| Keywords: Gd2 complexes crystal structures magnetic properties magnetic refrigeration properties |
| 投稿时间：2021-09-24 修订日期：2022-02-23 |
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| 赵晋宇,张雪瑾,杨晓敏,温娇娇,华宇鹏.两个Gd2配合物的晶体结构及磁制冷性质[J].无机化学学报,2022,38(5):921-929. |
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