具有特殊对称性的稀土-过渡金属配合物的磁各向异性研究

项目名称： 具有特殊对称性的稀土-过渡金属配合物的磁各向异性研究

项目编号： No.21501142

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 郭富盛

作者单位： 西北大学

项目金额： 20万元

中文摘要： 单分子磁体，因为其在量子计算和高密度信息储存上的潜在应用，加之其便于被设计合成、结构修饰和性能调控等一系列优点，备受化学家、物理学家和材料学家们的关注。近年来单分子磁体研究领域已然有了长足的发展，而不够高的磁弛豫温度和存在的磁量子遂穿效应限制着单分子磁体的实用化。本项目拟将选择和合成一系列具有特殊配位对称性（如C3、C5、C6等）并且对稀土和过渡金属有选择性配位的螯合配体，与Mn(III)、Co(II)、Tb(III)、Dy(III)等兼具有大的自旋值和磁各向异性的自旋载体组装，构筑具有特殊对称性的稀土-过渡金属多自旋磁交换的配合物。通过调节自旋载体的配位对称性来调控单分子磁体的自旋翻转能垒以及相应的磁弛豫温度，同时利用稀土和过渡金属之间较强的磁交换来抑制量子隧穿效应，从而提高单分子磁体的性能表现。研究结果将为构筑单分子磁体提供新的思路，为其实际应用提供前期的理论依据和实验支持。

中文关键词： 单分子磁体；稀土离子；过渡金属；磁各向异性；对称性

英文摘要： Single-Molecule Magnets (SMMs) have attracted considerable interests due to their potential applications as quantum computation and high density information storage materials, as well as that it is convenient to design, decorate and regulate the structures and performance of them. Remarkable progress with SMMs has occurred, but the practical application of them is limited by the not high temperature of magnetic relaxation and the presence of quantum tunnelling of the magnetization (QTM). In this project, firstly, we will choose and synthesize a serial of ligands that possess special local symmetry and would selectively chelate rare earths and transition metals through their different pore size. Secondly, new d-f type single-molecule magnets with special local symmetry are developed by combining the ligands with the spin carriers (such as Mn(III), Co(II), Tb(III) and Dy(III)) that possess magnetic moment and magnetic anisotropy. By adjusting the local symmetry of coordination of spin carriers, the energy barrier and applicable temperature of SMMs would be improved. In the meantime, the relatively strong magnetic interactions between the lanthanides and transition metals are introduced to inhibit the QTM so as to enhance the performance of SMMs. The results of the project will provide a new thought for constructing SMMs, and contribute the preliminary theoretical basis and experimental support for the practical application.

英文关键词： Single-Molecular Magnets;lanthanide;transition metal;magnetic anisotropy ;symmetry