Self-Assembled Ln(III)<sub>4</sub> (Ln = Eu, Gd, Dy, Ho, Yb) [2 × 2] Square Grids: a New Class of Lanthanide Cluster
作者:Nicholas M. Randell、Muhammad U. Anwar、Marcus W. Drover、Louise N. Dawe、Laurence K. Thompson
DOI:10.1021/ic4008813
日期:2013.6.3
Yb) into square [2 × 2] grid-like arrays has been readily effected using simple, symmetric ditopic ligands based on a carbohydrazone core. The metal ions are connected via single atom bridges (e.g., μ2-Ohydrazone, μ2-OH, μ2-OMe, μ2-1,1-N3–, μ4-O), depending on reaction conditions. The Gd(III)4 examples exhibit intramolecular antiferromagnetic exchange (−J < 0.11 cm–1), and in one Dy(III)4 example,
Ln(III)离子(Ln = Eu,Gd,Dy,Ho,Yb)自组装成正方形[2×2]网格状阵列的过程很容易就已经实现了,它是基于碳hydr核心的简单,对称的对位配位体。所述金属离子经由单原子桥连接(例如,μ 2 -O腙,μ 2 -OH,μ 2 -OMe,μ 2 -1,1-N 3 -,μ 4 -O),这取决于反应条件。钆(III)4点的例子显示出分子内反铁磁交换( - Ĵ <0.11厘米-1),且在一个镝(III)4例如,具有μ的组合2 -1,1-N 3 -和μ 4个-O桥联相邻的金属离子,SMM行为观察。一个热驱动松弛过程是在温度范围10-25ķ观察(τ 0 = 6.5(1)×10个-7 S,Ù EFF = 110(1)K)中的1800奥斯特外磁场的存在下,采用抑制第二个基于量子的弛豫过程。Ln(III)离子的扩展基团(通常是过渡金属离子)具有受控的自组装性,这表明该方法对镧系元素的一般适