Slow magnetic relaxation in a 3D dysprosium(Ⅲ)-fluoro-oxalate framework containing zig-zag [Dy-F]n chains  

作　　者：Leilei Li Yifan Fang Shuang Liu Mingfei Hu Wenzhen Wang 

机构地区：[1]College of Chemistry and Chemical Engineering,Xi'an Shiyou University,Xi'an 710065,China [2]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University,Tianjin 300071,China

出　　处：《Journal of Rare Earths》2023年第1期100-107,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (21901200);the Natural Science Foundation of Shaanxi Province(2019JQ-489,2019JZ-44);the Scientific Research Program of Shaanxi Provincial Education Department (18JK0607);the Young Talent Fund of Xi’an Association for Science and Technology (095920201319);the 111 project (B12015);the Postgraduate Innovation and Practice Training Program of Xi’an Shiyou University(YCS202121001)。

摘　　要：Dysprosium complexes based on [F-Dy] or near-linear [F-Dy-F] unit are of great concern in the field of single-molecule magnets due to their large magnetic anisotropy.Here,the crystal structure and the magnetic relaxation dynamics were reported for a three-dimensional(3 D) metal-organic framework(MOF):[DyF(C_(2)O_(4))(H_(2)O)2]n·2nH_(2)O(1),which is the unique MOF containing zig-zag [Dy-F]_(n) chains.Magnetic susceptibility characterization reveals that 1 is one of the few 3 D MOFs which show slow magnetic relaxation under zero dc field.And the effective energy barrier of 72 K for 1 is also higher than most Dy-based 3 D MOFs.The diamagnetic ion dilution study shows that the ferromagnetic exchange couplings mainly transmitted by F^(-) bridges in 1 contribute little to the energy barrier,but effectively suppress the quantum tunneling process and result in a smooth hysteresis loop with no waist-restricted step.

关 键 词：Dysprosium complex FLUORIDE Magnetic property Slow magnetic relaxation Exchange coupling Rare earths 

分 类 号：TM273[一般工业技术—材料科学与工程]