Hexagonal Bipyramidal Dy(III) Complexes as a Structural Archetype for Single-Molecule Magnets
Hexagonal Bipyramidal Dy(III) Complexes as a Structural Archetype for Single-Molecule Magnets
复制标题
六方双锥 Dy(III) 配合物作为单分子磁体的结构原型
DOI：
10.1021/acs.inorgchem.8b03206
复制
发表时间：
2019
影响因子：
4.6
通讯作者：
Dunbar Kim R
中科院分区：
文献类型：
--
作者：
Li Jing;Gomez Coca Silvia;Dolinar Brian S;Yan Li;Yu Fei;Kong Ming;Zhang Yi Quan;Song You;Dunbar Kim R
单分子磁体被认为是高密度信息存储和量子计算的优良纳米材料。金属离子晶场的局部对称性在追求高性能SMM中起着重要作用。本文报道了两种高度稳定的畸变六方双锥（准D6h）Dy配合物，它们表现出缓慢的磁化弛豫。设计了一个六方双锥Dy模型配合物，研究了其磁各向异性与对称性的关系。结合实验和理论的结果表明，量子隧穿是高度依赖于晶体场的局部对称性。当对称性更接近标准D6h几何时，磁各向异性变得更强。这些结果支持的结论，六方双锥几何结构是一个可行的设计新的类SMM。
Single-molecule magnets (SMMs), are regarded as excellent nanomaterials for high-density information storage and quantum computing. The local symmetry of the crystal field for the metal ion plays an important role in pursuing a high-performance SMM. Herein, two highly stable distorted hexagonal bipyramidal (quasi-D6h) Dy complexes exhibiting slow relaxation of the magnetization are reported. A hexagonal bipyramidal Dy model complex with 18-crown-6 was also designed to study the relationship between magnetic anisotropy and symmetry. The combined experimental and theoretical results indicate that quantum tunneling is highly dependent on the local symmetries of the crystal field. The magnetic anisotropy becomes much stronger when the symmetry is closer to a standardD6hgeometry. These results support the conclusion that the hexagonal bipyramidal geometry is a viable one for the design of new classes of SMMs.