CoⅡsingle-ion magnet and its multi-dimensional aggregations:Influence of the structural rigidity on magnetic relaxation process  

作　　者：Zhao-Bo Hu Ling-Ao Gui Long-He Li Tong-Tong Xiao Adam THand Pagnareach Tin Mykhaylo Ozerov Yan Peng Zhongwen Ouyang Zhenxing Wang Zi-Ling Xue You Song 

机构地区：[1]Chaotic Matter Science Research Center,Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China [2]State Key Laboratory of Coordination Chemistry,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China [3]Wuhan National High Magnetic Field Center&School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [4]Department of Chemistry,University of Tennessee,Knoxville,TN 37996,United States [5]National High Magnetic Field Laboratory,Florida State University,Tallahassee 32310,United States [6]Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China

出　　处：《Chinese Chemical Letters》2025年第2期518-522,共5页中国化学快报(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2021YFA1600304);Joint Fund for Regional Innovation and Development(No.U20A2073);National Natural Science Foundation of China(Nos.22373048,21973038,61904119 and 22105089);Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry(No.20212BCD42018);US National Science Foundation(NSF,No.CHE-2055499);the Interdisciplinary program of Wuhan National High Magnetic Field Center(No.WHMFC202133);the support of the NSF Research Traineeship Program(No.DGE-2152168)。

摘　　要：Two CoⅡ-based complexes,{[Co(dps)_(2)(N_(3))_(2)]·H_(2)O}_n(1)and[Co(dps)_(2)(N_(3))_(2)]_n(2),show a 1D chain and a 3D network,respectively.The central CoⅡions in the complexes have the same coordination environment with the[Co(dps)_(4)(N_(3))_(2)]unit.Although the differences in crystal parameters are nearly negligible,their magnetic properties are very different.AC susceptibility data show that 1 behaves as a typical field-induced single-ion magnet(SIM)with the out-of-phase(χ_(M)”)signals,while 2 shows ac signals ofχ_(M)”without peaks even under applied dc filed within our measurement window.Far-IR magneto-spectra(FIRMS)show strong spin-phonon couplings at 0 T in 2,likely making the magnetic relaxation in 2 fast,while the couplings are negligible in 1.Small spin-phonon coupling in 1 likely leads to slower magnetic relaxation,making 1 a SIM.The difference in the properties is due to the structural rigidity of 2 in its 3D network,leading to stronger spin-phonon coupling.Combined high-field EPR(HF-EPR)and FIRMS studies give spin-Hamiltonian parameters,including D=64.0(9)cm^(-1),|E|=15.7(2)cm^(-1)for 1 and D=80.0(2)cm^(-1),|E|=19.0(1)cm^(-1)for 2.

关 键 词：Spin-phonon coupling Slow magnetic relaxation Structural rigidity CoII compounds Far-IR magneto-spectra 

分 类 号：O469[理学—凝聚态物理] O641.4[理学—电子物理学]