| 微调镝(Ⅲ)离子配位环境提升单离子磁体有效能垒 | |
| Improving Energy Barrier by Altering Coordination Environment in Two Dy(Ⅲ) Single-Ion Magnets | |
| 摘要: 对于合成化学家来说，通过合成策略调控单离子磁体的磁动力学是一项艰巨的任务。我们以三（2-羟基亚苄基）三氨基胍配体（L）合成了2例单核Dy（Ⅲ）配合物[Dy（L）2（H2O）2]ClO4·2H2O·2CH3CN·CH3OH（1）和[Dy（L）2（H2O）2]CF3SO3·4H2O·2CH3OH（2）。对其结构和磁性研究表明，不同的抗衡阴离子对于配合物1和2的动态磁行为有显著影响。2个配合物中，Dy（Ⅲ）中心都具有三角形十二面体D2d对称性，在零直流场下表现出单离子磁体的行为，其有效能垒分别为358 K（1）和309 K（2）。结构参数对比表明轴向位置的键长和键角微小变化对轴向配体场产生了显著的影响，而轴向配体场的微小变化导致了2个配合物交流磁性的差异。 | |
| 关键词: 镝 配合物 磁性 单分子磁体 | |
| 基金项目: 国家自然科学基金（No.21871247，21801237）、吉林省自然科学基金（No.20200201244JC）和中国科学院基础前沿科学研究计划（No.ZDBS-LY-SLH023）资助。 | |
| Abstract: Altering the synthetic strategies and further tuning the magnetic dynamics of single-ion magnets (SIMs) are critical tasks for chemists. Two mononuclear Dy(Ⅲ) complexes[DyL2(H2O)2]ClO4·2H2O·2CH3CN·CH3OH (1) and [DyL2(H2O)2]CF3SO3·4H2O·2CH3OH (2) have been successfully synthesized by using tris(2-hydroxybenzylidene) triaminoguanidine ligand (L). Structural and magnetic investigations reveal that different counter anions play an important role in dynamic magnetic behaviors of 1 and 2. In both the complexes the Dy(Ⅲ) centers are eight-coordinated with triangular dodecahedron D2d symmetry. They all showed single-ion magnets (SIMs) behavior under zero dc applied field with effective energy barriers (Ueff) of 358 K (1) and 309 K (2), respectively. A comparison of the structural parameters shows that the small but significant changes at axial positions in bond lengths and bond angles affect the axial ligand field which in turn is mainly responsible for distinct magnetic properties of both the complexes. | |
| Keywords: dysprosium coordination compounds magnetism single-molecule magnets | |
| 投稿时间：2021-05-08 修订日期：2021-06-25 | |
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| ALI Basharat,李晓磊,唐金魁.微调镝(Ⅲ)离子配位环境提升单离子磁体有效能垒[J].无机化学学报,2021,37(8):1519-1526. | |
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| Support information: 相关附件： file210209_210209-SI_25Jun2021.doc | |
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