Introducing new polydentate oxime ligands into design of Single Molecular Magnets

单分子磁体(SMM)是一种作为微小磁体的分子，可以在非常高密度的数据存储中找到应用。在仍然较低的封闭温度下观察到SMM行为。此外，还必须增加SMM的分立态的能垒。结果表明，这些参数受系统总体磁各向异性的影响很大，需要具有轴对称性。根据这一观察结果，我们提出了一种通过引入三齿肟配体来设计SMM的新策略。三类这类配体的设计都带有肟基，能够在不同的金属离子之间起到有效的连接作用。我们发现这些配体可以用来形成具有可控结构基元的磁各向异性金属络合物。与选定试剂反应中的进一步聚集应该会导致材料具有更吸引人的磁性。产品将根据结构(X射线衍射、光谱学)和磁性行为(SQUID磁测法)进行表征。对增强的SMM特性的观察，以及对SMM现象的新的总体洞察，是可望的。

Single Molecular Magnets (SMMs) are molecules behaving as tiny magnets that could find application in very high-density data storage. SMM behavior is observed under still low blocking temperatures. Also the energy barrier separating states of SMMs has to be increased. It was shown that these parameters are highly influenced by the overall magnetic anisotropy of the system, which needs to possess axial symmetry. Following this observation, we propose a new strategy in the design of SMMs by introducing tridentate oxime ligands. Three classes of such ligands are designed with oxime group able to act as an efficient linker between different metal ions. We show that the ligands can be used to form magnetically-anisotropic metal complexes with controllable structural motifs. Further aggregation in reaction with selected reagents should lead to materials with even more attractive magnetic properties. The products will be characterized with respect to structure (X-ray diffraction, spectroscopy) and magnetic behavior (SQUID magnetometry). Observation of enhanced SMM properties, as well as gaining new general insights into the SMM phenomenon, are expected.