Sensitive magnetic-field-response magnetization dynamics in a one-dimensional dysprosium coordination polymer,Inorganic Chemistry Frontiers

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Sensitive magnetic-field-response magnetization dynamics in a one-dimensional dysprosium coordination polymer
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-08-19 , DOI: 10.1039/d1qi00873k
Yun-Xia Qu ₁ , Ze-Yu Ruan ₁ , Guo-Zhang Huang ₁ , Yan-Cong Chen ₁ , Yang Liu ₁ , Jian-Hua Jia ₁ , Jun-Liang Liu ₁ , Ming-Liang Tong ₁

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One-dimensional (1D) magnetic materials are intriguing due to their low densities and structural and chemical versatility. Herein a Dy(III) coordination polymer with significant single-molecule magnet behavior has been constructed with a strongly magnetic anisotropic Dy(III) motif and a luminescence-active bis(diphenylphosphinyl)hexane ligand. An energy barrier of 626 K and butterfly-like hysteresis loops below 9 K are unprecedented for lanthanide coordination polymers. Moreover, the frequency-dependent out-of-phase alternating-current susceptibility shows clear field dependence of the double-relaxation-time pattern, which exhibits an “isosbestic point” over the increasing applied magnetic field; however, it disappears in the sample diluted with diamagnetic Y(III), which strongly indicates that the magnetic dipole interaction is responsible for the presence of the “isosbestic point”. The photoluminescence spectra provide crucial information on the energy level that is consistent with the energy barrier and show semi-quantitative agreement with the result of ab initio calculations. The construction of this Dy(III) polymer provides a good example to explore the sensitive magnetic-field-response magnetization dynamics involving magnetic dipole interaction, by overcoming which the magnetic relaxation time can be tuned via an external magnetic field.

中文翻译：

一维镝配位聚合物的灵敏磁场响应磁化动力学

一维 (1D) 磁性材料因其低密度和结构和化学多功能性而引人入胜。在此，已经构建了具有显着单分子磁体行为的 Dy( III ) 配位聚合物，该聚合物具有强磁性各向异性 Dy( III ) 基序和发光活性双（二苯基膦基）己烷配体。对于镧系配位聚合物而言，626 K 的能垒和低于 9 K 的蝴蝶状磁滞回线是前所未有的。此外，与频率相关的异相交流磁化率显示出双弛豫时间模式的明显场相关性，在增加的外加磁场中表现出“等吸收点”；然而，它在用抗磁性 Y( III)稀释的样品中消失了)，这强烈表明磁偶极子相互作用是“等吸收点”存在的原因。光致发光光谱提供了与能垒一致的能级的关键信息，并显示出与ab initio计算结果的半定量一致。这种 Dy( III ) 聚合物的构建为探索涉及磁偶极相互作用的敏感磁场响应磁化动力学提供了一个很好的例子，通过克服它可以通过外部磁场调整磁弛豫时间。

更新日期：2021-09-09

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