双核Dy配合物的合成及其单分子磁体行为
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摘要
为进一步研究耦合作用对自旋弛豫的影响,以五水合硝酸镝、六水合硝酸锌及配体为起始物,二甲基甲酰胺(DMF)为溶剂,合成了新的双核Dy配合物[Dy_2Zn_2(L)_4(NO_3)_2(DMF)_2](1)。X射线单晶衍射结果表明,该化合物结晶于单斜晶系,P2_1/n空间群。直流磁化率测试结果表明双核Dy之间具有铁磁耦合相互作用;零场条件下该化合物交流磁化率表现出频率依赖性质,是1个典型的单分子磁体。通过拟合得到该化合物零场时有效能垒为261K,弛豫时间为2.38×10~(-8)s。
To gain a deep insight into the impact of coupling interaction on spin relaxation,a new dinuclear Dy(Ⅲ)-based complex[Dy_2Zn_2(L_4(NO_3)_2(DMF)_2](1)was synthesized using Dy(NO_3)_3 ·5 H_2O,Zn(NO_3)_2 ·6H_2O and(E)-2-ethoxy-6-(((2-hydroxyphenyl)imino)methyl)phenol as starting materials.X-ray diffraction(XRD)measurement reveals that complex1 crystallizes in the monoclinic space group P2_1/n.Direct current(DC)magnetic properties for complex1 indicate the existence of ferromagnetic dipolar interaction between Dy(Ⅲ)ions.AC susceptibility measurements show that both in-phase(χ)and out-of-phase(χ″)susceptibility are frequency-dependent under zero dc field,which is the typical feature of single-molecule magnets(SMMs).The energy barrier and relaxation time are fitted to be 261 Kand 2.38×10~(-8) s,respectively.
To gain a deep insight into the impact of coupling interaction on spin relaxation,a new dinuclear Dy(Ⅲ)-based complex[Dy_2Zn_2(L_4(NO_3)_2(DMF)_2](1)was synthesized using Dy(NO_3)_3 ·5 H_2O,Zn(NO_3)_2 ·6H_2O and(E)-2-ethoxy-6-(((2-hydroxyphenyl)imino)methyl)phenol as starting materials.X-ray diffraction(XRD)measurement reveals that complex1 crystallizes in the monoclinic space group P2_1/n.Direct current(DC)magnetic properties for complex1 indicate the existence of ferromagnetic dipolar interaction between Dy(Ⅲ)ions.AC susceptibility measurements show that both in-phase(χ)and out-of-phase(χ″)susceptibility are frequency-dependent under zero dc field,which is the typical feature of single-molecule magnets(SMMs).The energy barrier and relaxation time are fitted to be 261 Kand 2.38×10~(-8) s,respectively.
引文
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[15]MONDAL K,KOSTAKIS G,POWELL K,et al.Defect-dicubane Ni2Ln2(Ln=Dy,Tb)single molecule magnets[J].Inorganic Chemistry,2011,50(22):11604-11611.
[16]SHELDRICK G.SHELXTL-97,program for X-ray crystalstructure solution[M].Germany:Universitt of G9ttingen,1997.
[17]RINEHAR J,MEIHAUS K,LONG J.Observation of a secondary slow relaxation process for the field-induced single-molecule magnet U(H2BPz2)3[J].Journal of the American Chemical Society,2010,132:7572-7573.
[18]TANG Jinkui,HEWITT I,MADHU N,et al.Dysprosium triangles showing single-molecule magnet behavior of thermally excited spin states[J].Angewandte Chemie International Edition,2006,45:1729-1733.
[19]KATOH K,KAJIWARA T,YAMASHITA M,et al.Magnetic relaxation of single-molecule magnets in an external magnetic field:An Ising dimer of a terbium(III)-phthalocyaninate triple-decker complex[J].Chemistry-A European Journal,2011,17:117-122.
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