Dramatic Impact of Auxiliary Ligands on the Dynamic Magnetic Relaxation in Tetranuclear Dy^(III)_(2)Zn^(II)_(2) Single Molecule Magnets  

作　　者：Gao-Peng Li Hong-Fang Xie Shi-Rui Yang Yun-Long Fu Yi-Quan Zhang Yao-Yu Wang 

机构地区：[1]Key Laboratory of Magnetic Molecules&Magnetic Information Materials of the Ministry of Education,School of Chemistry&Material Science,Shanxi Normal University,Taiyuan,Shanxi,030031 China [2]Weinan Bureau of Natural Resources and Planning,Weinan,Shaanxi,714000 China [3]Jiangsu Key Laboratory for NSLSCS,School of Physical Science and Technology,Nanjing Normal University,Nanjing,Jiangsu,210023 China [4]Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education,Shaanxi Key Laboratory of Physico-Inorganic Chemistry,College of Chemistry and Materials Science,Northwest University,Xi'an,Shaanxi,710127 China

出　　处：《Chinese Journal of Chemistry》2022年第20期2415-2420,共6页中国化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21971207,21973046);the Natural Science Foundation of Science and Technology Agency of Shanxi Province(No.20210302124654);the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2021259).

摘　　要：Better understanding the determining factors of dynamic magnetic relaxation in polynuclear lanthanide based single-molecule magnets(SMMs)remains a challenge due to the complexity of such architectures involving interactions between the magnetic centers.To address this issue,two structurally related heterometal Dy^(III)_(2)Zn^(II)_(2) SMMs,[Zn_(2)Dy_(2)(L)_(4)(Ac)_(2)(DMF)(CH_(3)OH)]·CH_(3)OH·2H_(2)O(1)and[Zn_(2)Dy_(2)(L)_(4)(Ac)_(2)(DMF)_(2)]·4CH_(3)CN(2)(H_(2)L=(E)-2-((2-hydroxy-3-methoxybenzylidene)amino)-4-methyphenol,DMF=N,N-dimethylformamide),are introduced and investigated.Through modifying the auxiliary ligands on one Dy^(III) site while retaining that on the other Dy^(III),the intramolecular magnetic interactions and relaxation dynamics in these two heterometallic-Dy^(III)_(2)Zn^(II)_(2) SMMs can be tuned,demonstrating a dramatic change in the magnet relaxation behavior with energy barrier changing from a negligible value for 1 to 305 K for 2.Ab initio calculations reveal that changing the coordination geometries on the Dy^(III) sites can significantly affect the magnetic interactions as well as single-ion anisotropy.

关 键 词：Single-molecule magnets Dynamic magnetic relaxation DYSPROSIUM Auxiliary ligands Ab initio calculations 

分 类 号：O62[理学—有机化学]