Synthesis, Structure, and Magnetic Properties of Rare-Earth Bis(diazabutadiene) Diradical Complexes
作者:Haihan Yan、Botao Wu、Yin-Shan Meng、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1021/acs.inorgchem.0c03534
日期:2021.2.1
New kinds of diradical rare-earth metal complexes supported by diazabutadiene (DAD) ligands, [(DAD)2LnN(TMS)2] (1; Ln = Dy, Lu; TMS = SiMe3), were synthesized and studied. They showed a new [radical–Ln–radical] alignment with distorted square-pyramidal geometry. Structural and density functional theory analysis illustrated the radical anionic nature of the ligands. Magnetic studies revealed antiferromagnetic
合成并研究了由二氮杂丁二烯(DAD)配体支撑的新型双自由基稀土金属配合物[(DAD)2 LnN(TMS)2 ](1 ; Ln = Dy,Lu; TMS = SiMe 3)。他们显示了一种新的[自由基-Ln-自由基]排列,其方锥体几何变形。结构和密度泛函理论分析说明了配体的自由基阴离子性质。磁性研究显示1-Lu中两个自由基的反铁磁耦合。1-Dy具有典型的单分子磁体(SMM)行为,有效能垒为231 K,远高于类似的含自由基SMM。磁结构分析表明,阴离子[N(TMS)2 ] -组在SMM属性中起着至关重要的作用。这项研究提供了一个新的平台,可以进一步提高基本型Ln SMM的性能。