稀土MOFs基单分子磁体的构筑和光刺激单晶及磁性可逆转变研究

Synthesis of photoresponsive lanthanide single-molecule magnets (SMMs) which can transform reversibly with crystallinity retaining is of great significance for further study of photoregulation and magnetic relaxation response mechanisms, and promoting the application in magnetic storage, magnetic switches, and magnetic sensors. However, the development of this area and related response mechanism was limited by the irreversible crystallinity during stimulating process. Directed by the syntsesis of reversible photoresponsive SMMs, we herein propose a strategy for constructing lanthanide metal-organic frameworks (Ln-MOFs) based SMMs which can transform reversibly by assembling photoactive bipyridinium carboxylate ligand and lanthanide ions (Tb3+, Dy3+,Er3+) owning oblate electron density distributions, with the phenol derivatives providing strong axial magnetic anisotropy as terminal auxiliary ligands. Furthermore, the photoresponsive performance and magnetic relaxation mechanism will be studied. The implementation of this project has important scientific significance for guiding the synthesis of new photoresponsive SMMs and promoting the development of this field.

单晶可逆转变的光刺激响应型稀土单分子磁体的合成对于深入研究光调控规律及磁弛豫响应机理，促进光刺激响应单分子磁体在磁存储、磁开关、磁传感领域的应用具有重要作用。然而，刺激转变过程中单晶结构通常不可逆，限制了相关规律、机理的建立和该领域的发展。本项目以合成单晶可逆转变的光刺激响应型稀土单分子磁体为导向，拟以光敏的联吡啶鎓盐羧酸类化合物为有机桥连配体，以提供强轴向磁各向异性的单齿苯酚类化合物为端基辅助配体，和基态具有扁平电子云分布的稀土金属离子Tb3+, Dy3+, Ho3+组装，定向构筑光刺激响应的稀土MOFs基单分子磁体，深入研究其光刺激响应规律及磁弛豫机理。项目的实施对指导合成新型光刺激响应单分子磁体，推动光刺激响应单分子磁体领域的发展具有重要的科学意义。

本项目以光敏的联吡啶鎓盐羧酸类化合物为有机桥连配体，以提供强轴向磁各向异性的单齿苯酚类化合物为端基辅助配体，和基态具有扁平电子云分布的稀土金属离子Tb3+, Dy3+, Ho3+组装，构筑了光刺激响应的稀土MOFs基单分子磁体，研究了其光刺激响应规律及磁弛豫机理。项目的开展对指导合成新型光刺激响应单分子磁体提供了新方法，推动了光刺激响应单分子磁体领域的发展。