等结构
八面体
结晶学
磁制冷
镧系元素
稀土
镧系收缩
化学
发光
晶体结构
离子
光致发光
材料科学
磁化
矿物学
物理
磁场
有机化学
量子力学
光电子学
作者
Chen Xiao,Yan Peng,R. -L. Gao,Hongmei Wang,Pei Chen
标识
DOI:10.1016/j.jssc.2022.123067
摘要
An isostructural series of rare earth complexes has been synthesized by using the dimethylarsinate ligand. All complexes have the formula [Ln(Me2AsO2)3][H2O]8 (Ln = Sm(1), Eu(2), Gd(3), Tb(4), Dy(5), Ho(6), Er(7), Tm(8), Yb(9), Y(10)). They are the first rare earth complexes ligated by organoarsinate. Crystallographic characterizations reveal that all the compounds feature 1D chain-like arrangements, in which two rare earth ions are bounded by three dimethylarsinate ligands (syn,syn, μ2-ƞ1:ƞ1) and the rare six-coordinated rare earth ions display ideal octahedron coordination geometry. The solid state photoluminescent studies reveal that compounds 2 and 4 exhibit the characteristic emission band of the EuIII and TbIII ions respectively. Magnetic measurements indicate Gd(3) shows magnetocaloric effect (MCE) with entropy change of 24.92 J kg–1 K–1 for ΔH = 0 – 7 T at 3 K. The Dy(5) and Yb(9) show field induced slow relaxation, which is rare for octahedron coordinate LnIII compounds.
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