Structures and magnetic relaxation properties of cyclopentadienyl/β-diketonate/trispyrazolylborate hybridized dysprosium single-molecule magnets  

作　　者：Lu Zhang Jin Xiong Yin-Shan Meng Tao Liu 

机构地区：[1]State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,China [2]Department of Chemistry,Carnegie Mellon University,Pittsburgh,PA 15213,United States

出　　处：《Chinese Chemical Letters》2023年第8期467-471,共5页中国化学快报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.22222103,22173015,22025101,21801037,91961114 and 21871039);the Fundamental Research Funds for Central University,China。

摘　　要：The combination of cyclopentadiene,β-diketonate and tripyrazoylborate ligands with dysprosium ion afforded five mononuclear compounds:[(Cp)2Dy(Tp∗)](1Dy),[(Cp)Dy(Tp∗)Cl(THF)](2Dy),[(Cp)Dy(Tp)Cl(THF)](3Dy),[(DBM)Dy(Tp)Cl(THF)](4Dy),[{(Tp)Dy(DBM)_(2)(H_(2)O)}·THF](5Dy)(Cp=cyclopentadiene;Tp∗=hydrotris(3,5-dimethyl-1-pyrazolyl)borate;Tp=hydrotris(1-pyrazolyl)borate;DBM=dibenzoylmethanoate).Magnetic study revealed that 1Dy and 3Dy exhibited typical butterfly-type hysteresis.AC susceptibility study combined with ab initio calculations indicated that the magnetic relaxation behaviors of 1Dy–4Dy were governed by the Orbach and Raman processes under applied DC field.Moreover,3Dy showed two-step magnetic relaxation,which was attributed to the static disordering of the coordinated THF molecule.Magnetic anisotropy analysis indicated that it was the relative strength of the interactions between DyIII and surrounding ligands that determined the orientation of the magnetic easy axis.

关 键 词：Single-molecule magnets Lanthanide complexes Magnetic anisotropy Magnetic relaxations Quantum tunneling of magnetization 

分 类 号：O641.4[理学—物理化学]