State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
Inorg Chem. 2013 Jun 3;52(11):6595-602. doi: 10.1021/ic400620j. Epub 2013 May 16.
The reactions between a salen ligand N,N'-bis(3-methoxysalicylidene)-1,2-cyclohexanediamine (H2L) and different metal salts lead to the formation of four 3d-4f [MDy] and [MDy]2 (M = Zn/Cu) compounds, where the [MDy]2 can be considered as resulting from the assembly of two [MDy] building blocks. Field-induced single molecule magnet (SMM) behavior was observed in [ZnDy] and [CuDy] compounds with the effective suppression of fast quantum tunneling under a dc field. Moreover, the [ZnDy]2 compound demonstrates typical SMM behavior, which may originate from the high axial anisotropy of Dy ions correlating to the change of coordination geometry and enhanced ferromagnetic interactions between Dy ions via the coupling of two [DyZn] units. The result suggests the positive effects of coupling blocking units to enhance their SMM behavior, presenting a promising strategy for constructing efficient heterometallic SMMs.
手性水杨醛亚胺配体 N,N'-双(3-甲氧基水杨醛)-1,2-环己二胺(H2L)与不同金属盐反应生成了四个 3d-4f [MDy] 和 [MDy]2 (M = Zn/Cu)化合物，其中[MDy]2 可以被认为是由两个 [MDy] 构筑块组装而成。在 [ZnDy] 和 [CuDy] 化合物中观察到了场诱导的单分子磁体(SMM)行为，在直流场下有效抑制了快速量子隧穿。此外，[ZnDy]2 化合物表现出典型的 SMM 行为，这可能源于 Dy 离子的高轴各向异性与配位几何结构的变化有关，并且通过两个 [DyZn] 单元的耦合增强了 Dy 离子之间的铁磁相互作用。该结果表明，通过耦合阻断单元来增强其 SMM 行为具有积极意义，为构建高效的杂金属 SMM 提供了一种有前景的策略。
