| 氰基桥联的Fe2Ni2单分子磁体的合成与磁性 |
| Synthesis and Magnetism of Cyano-bridged Fe2Ni2 Single-Molecule Magnets |
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| 摘要: 利用三氰基构筑单元Bu4N[FeⅢ（PzTp）（CN）3]（PzTp=tetrakis（pyrazolyl）borate）和4，4'-二甲氧基-2，2'-联吡啶（4，4'-dmobpy）配体，合成了2例氰基桥联的FeⅢ2NiⅡ2四核配合物。单晶X射线衍射表明化合物[FeⅢ（PzTp）（CN）3]2[NiⅡ2（4，4'-dmobpy）4][FeⅢ（PzTp）（CN）3]2·2CH3OH（1）和[FeⅢ（PzTp）（CN）3]2[NiⅡ2（4，4'-dmobpy）4]（PF6）2（2）具有四核四方形分子结构。直流磁化率测试表明配合物1和2均表现为分子内的铁磁耦合作用。交流磁化率测试表明配合物1和2在零场下具有慢磁弛豫行为，有效能垒分别为12.8和13.0 K。 |
| 关键词: 氰基桥联 单分子磁体 铁磁耦合 |
| 基金项目: 国家自然科学基金（No.21871039，21801037，91961114，21903011，21421005）资助项目。 |
| Abstract: Two cyano-bridged Fe2Ni2 complexes were synthesized via the reaction of tricyanometallate building block Bu4N[FeⅢ(PzTp)(CN)3] (PzTp=tetrakis(pyrazolyl)borate) and 4,4'-dimethoxy-2,2'-bipyridine (4,4'-dmobpy) ligand. X-ray diffraction study reveals that complexes [FeⅢ (PzTp) (CN)3]2[NiⅡ2(4, 4'-dmobpy)4] [FeⅢ (PzTp) (CN)3]2·2CH3OH (1) and [FeⅢ (PzTp) (CN)3]2[NiⅡ2(4, 4'-dmobpy)4] (PF6)2 (2) exhibit a tetranuclear square structure. Direct current susceptibility measurements indicate that 1 and 2 show intramolecular ferromagnetic interactions between Fe(Ⅲ) and Ni(Ⅱ) ions. Complexes 1 and 2 show the magnetic relaxation property in the absence of dc field, behaving as single-molecule magnets. The fitted relaxation energy barrier Ea/kB for 1 and 2 were 12.8 and 13.0 K, respectively. |
| Keywords: cyano-bridged single-molecule magnet ferromagnetic interaction |
| 投稿时间：2020-03-14 修订日期：2020-08-03 |
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| 吴家起,孟银杉,朱海浪,矫成奇,刘涛.氰基桥联的Fe2Ni2单分子磁体的合成与磁性[J].无机化学学报,2020,36(12):2331-2339. |
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