Structures and magnetic properties of cyclic heterometallic tetranuclear clusters

Structures and magnetic properties of cyclic heterometallic tetranuclear clusters
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环状异金属四核团簇的结构和磁性能

DOI:
10.1016/j.poly.2017.02.007
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发表时间:
2017-05
期刊:
影响因子:
2.6
通讯作者:
Song Xue-Qin
Song Xue-Qin
中科院分区:
化学3区
文献类型:
--
作者:
Liu Yuan-Ang;Wang Cai-Yun;Zhang Mo;Song Xue-Qin

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合成了一种新的水杨酰胺类Salen多齿配体1-(2-羟基-3-甲氧基-苯甲酰氨基)-2-(2-羟基-3-甲氧基-苯亚甲基氨基)-乙烷(H3 L),并将其用于构建异金属磁性簇合物。合成了四个新的热稳定的环状四核杂金属簇合物,并通过元素分析、X射线衍射、红外光谱和热重分析对其结构进行了表征。在溶剂热条件下,以高产率合成了[M2 Ln 2L 2(NO3)4](M2 Ln 2,其中MII = Cu Ⅱ,Ni Ⅱ,LnIII = Tb Ⅲ,Dy Ⅲ).随温度变化的磁化率测量表明,Cu_2Ln_2中Cu_II和Ln_III之间存在强的铁磁相互作用,通过比较它们的磁化率与含有抗磁性Ni_2Ln_2离子的同构Ni_2Ln_2团簇的磁化率来评价。此外,对四种四核化合物的交流磁化率研究表明,Cu_2Ln_2表现出有趣的慢磁化弛豫的SMM行为,并且Cu_2 Tb_2的有效能垒可以通过施加2000 Oe直流外磁场的交流磁化率测量来获得。
A new salicylamide Salen-like multidentate ligand, 1-(2-hydroxy-3-methoxy-benzamido)-2-(2-hydroxy-.3-methoxy-benzylideneamino)-ethane (H3L), was synthesised and used to build up heterometallic magnetic.clusters. As a result, four new highly thermal stable cyclic tetranuclear heterometallic clusters.which were characterized by elemental analysis, X-ray diffraction, IR and TGA measurements,.[M2Ln2L2(NO3)4] (M2Ln2, where MII = CuII, NiII and LnIII = TbIII, DyIII), were successfully obtained with high.yield under solvothermal conditions. Temperature-dependent magnetic susceptibility measurements.exhibit strong ferromagnetic interactions between CuII and LnIII in Cu2Ln2 which were evaluated by comparing.their magnetic susceptibilities with those of the isostructural Ni2Ln2 clusters containing diamagnetic.NiII ions. Furthermore, alternating-current magnetic susceptibility studies carried out for the four.tetranuclear compounds indicate that Cu2Ln2 exhibit interesting slow relaxation of magnetization of.the SMM behavior and the effective energy barriers for Cu2Tb2 can be obtained from alternating-current.susceptibility measurements by applying an external 2000 Oe direct-current field.
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