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Double Ligand Activation in Silyl-Substituted Rare-Earth Cyclobutadienyl Complexes
Organometallics ( IF 2.5 ) Pub Date : 2019-12-20 , DOI: 10.1021/acs.organomet.9b00763
Anindita Chakraborty 1 , Benjamin M. Day 1 , James P. Durrant 1, 2 , Mian He 1 , Jinkui Tang 3 , Richard A. Layfield 1
Affiliation  

The sodium cyclobutadienyl (Cb) reagent [Na24-C4(SiMe3)4}(THF)]2 (2) reacts with rare-earth halides [MCl3(THF)x], where M = Y, Dy (x = 3.5) and Lu (x = 3), giving the sandwich coordination polymers [M{η3-C4(SiMe3)4H}{η4-C4(SiMe3)3-κ-(CH2SiMe2}Na] (3M, M = Y, Dy, Lu). The coordination environments of the rare-earth metals in 3M feature an η4-cyclobutadienyl ligand, with additional coordination by a tuck-in trimethylsilyl group and an η3-cyclobutenyl ligand. The ligand activation is thought to be a consequence of deprotonation of the Cb ligand by 2. The axial nature of the crystal field in 3M is reflected in the single-molecule magnet properties of 3Dy, which has an anisotropy barrier of 309 cm–1 in zero applied magnetic field.

中文翻译:

甲硅烷基取代的稀土环丁二烯配合物中的双配体活化

所述cyclobutadienyl钠(CB)试剂的[Na 24 -C 4(森达34 }(THF)] 22与稀土类卤化物)反应[的MC1 3(THF)X ],其中M = Y,镝(X = 3.5)和路(X = 3),得到夹层配位聚合物[M {η 3 -C 4(森达34 H} {η 4 -C 4(森达33 -κ-(CH 2 SiMe 2 } Na] 3M,M = Y,Dy,Lu)。在稀土类金属的配位环境3中号设有一个η 4通过-cyclobutadienyl配体,用另外的协调一折入三甲基甲硅烷基和η 3 -cyclobutenyl配体。认为配体活化是Cb配体被2去质子化的结果。3 M中的晶体场的轴向性质反映在3 Dy的单分子磁体性质中,该性质在零施加磁场中具有309 cm –1的各向异性势垒。
更新日期:2019-12-21
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