Strong Antiferromagnetic Exchange-Coupling Observed in Hydride-Bridged Dimeric Dysprosium(Ⅲ)Single-Molecule Magnet  

作　　者：Qian-Cheng Luo Ke-Xin Yu Peng-Bo Jin Ye-Ye Liu Yuan-Qi Zhai Yan-Zhen Zheng 

机构地区：[1]Frontier Institute of Science and Technology,State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Key Laboratory of Electronic Devices and Materials Chemistry,School of Chemistry and School of Physics,Xi'an Jiaotong University,99 Yanxiang Road,Xi'an,Shaanxi,710054 China

出　　处：《Chinese Journal of Chemistry》2024年第4期391-396,共6页中国化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21971203);Key Scientific and Technological Innovation Team of Shaanxi Province(2020TD-001);the Joint Fund for Regional Innovation and Development(U20A2073)and the Fundamental Research Funds for Central Universities.

摘　　要：One dihydride-bridged dimeric Dy(Ⅲ)guanidinate complex,formulated as[{(Me_(3)Si)_(2)NC(NiPr)_(2)}_(2)Dy(μ-H)]_(2)(1Dy),was successfully isolated and the introduction of hydride bridges significantly reduces the intramolecular Dy(Ⅲ)…Dy(Ⅲ)distance to only 3.688(1)Å.To investigate the effect of such a short Dy(Ⅲ)…Dy(Ⅲ)distance on magnetism,we also prepared its dibromide-bridged analogue[{(Me_(3)Si)_(2)NC(NiPr)_(2)}_(2)Dy(μ-Br)]_(2)(2Dy),which has a much longer Dy(Ⅲ)…Dy(Ⅲ)distance of 4.605(4)Å.Surprisingly,2Dy demonstrates much larger effective energy barrier for magnetization reversal(U_(eff))and higher blocking temperature(T_(B)).The worse performance of 1Dy is attributed to the concerted effect of strong antiferromagnetic interactions between Dy(Ⅲ)ions(J_(total)=–2.683 cm^(–1))and the unparallel arrangement of magnetic principle axes of the Dy(Ⅲ)ions for 1Dy.

关 键 词：Single-molecule magnets LANTHANIDES Guanidinate ligand Hydride bridge Magnetic properties Ab initio calculations 

分 类 号：O61[理学—无机化学]