立方体的平方：一系列八配位镧系金属配合物，包括 Dy8 单分子磁体。
Squaring the cube: a family of octametallic lanthanide complexes including a Dy8 single-molecule magnet.
机构信息
Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA.
出版信息
Dalton Trans. 2013 Oct 1;42(41):14693-701. doi: 10.1039/c3dt51727f.
A series of isostructural octanuclear lanthanide complexes of general formula [Ln8(sao)4(μ3-OH)4(NO3)12(DMF)12] (Ln = Nd (), Sm (), Eu (), Gd (), Tb (), Dy (), Ho (), Er (); DMF = dimethylformamide) have been prepared via reactions of salicylaldoxime (saoH2), tetramethylammonium hydroxide (Me4NOH) with the appropriate lanthanide nitrate salt (Ln(NO3)3·6H2O). The metallic skeletons of the complexes describe [Ln4] tetrahedra encapsulated inside a [Ln4] square with the inner core stabilised through μ3-OH(-) ions and the periphery by μ4-sao(2-) ligands. The magnetic properties of compounds were investigated by dc and ac magnetometry. Temperature dependent ac magnetic susceptibility data reveal that the dysprosium analogue () displays an out-of-phase signal in the absence of an applied magnetic field indicative of slow relaxation of the magnetization typical of a Single-Molecule Magnet (SMM). Micro-SQUID measurements reveal temperature and sweep rate dependent hysteresis below 1.0 K.
一系列结构相同的八核镧系元素配合物，通式为[Ln8(sao)4(μ3-OH)4(NO3)12(DMF)12]（Ln = Nd (), Sm (), Eu (), Gd (), Tb (), Dy (), Ho (), Er (); DMF = 二甲基甲酰胺）是通过水杨醛肟（saoH2）、四甲基氢氧化铵（Me4NOH）与适当的镧系硝酸盐盐（Ln(NO3)3·6H2O）反应制备的。配合物的金属骨架描述为[Ln4]四面体被包裹在[Ln4]正方形内部，内部核心通过μ3-OH(-)离子稳定，外围通过μ4-sao(2-)配体稳定。通过直流和交流磁强计研究了化合物的磁性。温度依赖的交流磁化率数据表明，在没有外加磁场的情况下，镝的类似物（）显示出反相信号，表明磁矩的缓慢弛豫，这是典型的单分子磁体（SMM）的特征。微 SQUID 测量显示在 1.0 K 以下存在温度和扫描速率依赖性磁滞。
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