两个氰根桥连异双核DyCr配合物的合成和磁性研究  

Synthesis and magnetic properties of two cyano-bridged DyCr heterodinuclear complexes

作　　者：王飞 邱关霞 梁露予 龚慧文 刘贝 方玥懿 朱文华[1] WANG Fei;QIU Guanxia;LIANG Luyu;GONG Huiwen;LIU Bei;FANG Yueyi;ZHU Wenhua(College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China)

机构地区：[1]湖北大学化学化工学院,湖北武汉430062

出　　处：《湖北大学学报（自然科学版）》2021年第5期577-583,共7页Journal of Hubei University：Natural Science

基　　金：北京分子科学国家研究中心开放课题基金(BNLMS201820)资助。

摘　　要：具有大的自旋基态和磁各向异性的Dy^(Ⅲ)离子在很多构筑的单分子磁体中能够较好地显示单离子磁弛豫性质,通过在Dy^(Ⅲ)离子配合物中引入3d过渡金属离子构筑3d-4f化合物,可探究不同金属离子之间的磁相互作用以及过渡金属离子对Dy^(Ⅲ)离子化合物磁性能的影响.采用六氰合铬酸根作为氰根前驱体和具有相似结构的含氧有机物作为辅助配体,以溶剂挥发法与稀土Dy^(Ⅲ)离子构筑了两种局部配位几何结构为三角十二面体(D2d)的氰根桥连3d-4f异双核配合物1DyCr和2DyCr.对配合物1DyCr和2DyCr进行了结构表征、热稳定性测试和磁学性质探究,热稳定性测试结果表明化合物具有较好的热稳定性,磁性研究表明化合物1DyCr具有较大的磁各向异性,而两个化合物中Dy^(Ⅲ)与Cr^(Ⅲ)离子之间可能存在较强的反铁磁相互作用,导致产生较强的磁化强度量子隧穿(QTM)效应而不表现出磁弛豫行为.The Dy^(Ⅲ)ions with large spin ground states and high anisotropy can exhibit excellent single-ion magnetic relaxation properties in many constructed single-molecule magnets.By introducing the 3d transition metal ions into Dy^(Ⅲ)-containing compounds to construct 3d-4f compounds,the magnetic interactions between different metal ions and the effect of transition metal ions on the magnetic properties of Dy^(Ⅲ)-containing compounds could be explored.Using hexacyanochromate as the cyanide precursor and oxygen-containing organic matter with similar structure as auxiliary ligand,two kinds of cyano-bridged 3d-4f heterodinuclear complexes with the local coordination geometric structure of the triangular dodecahedron(D2d)structure were constructed with the Dy^(Ⅲ)ions by solvent evaporation method.The structure characterization,thermal stability test and magnetic properties of the compounds 1DyCr and 2DyCr were carried out.The thermal stability test results showed that the compound had good thermal stability,and the magnetic research showed that the compound 1DyCr had a large magnetic anisotropy.There is a possible strong antiferromagnetic interaction between Cr^(Ⅲ)and Dy^(Ⅲ)ions in the two compounds,which leads to the existence of QTM effect without showing magnetic relaxation behaviour.

关 键 词：DyⅢ化合物 六氰铬酸盐 3d-4f异双核化合物 热稳定性 磁性 

分 类 号：O61[理学—无机化学]