A new family of boat-shaped Ln8 clusters exhibiting the magnetocaloric effect and slow magnetic relaxation,Dalton Transactions

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A new family of boat-shaped Ln8 clusters exhibiting the magnetocaloric effect and slow magnetic relaxation
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-08-24 , DOI: 10.1039/d1dt02390j
Jia-Nian Li ₁ , Ning-Fang Li ₁ , Ji-Lei Wang ₁ , Xiao-Mei Liu ₁ , Qing-Dong Ping ₁ , Ting-Ting Zang ₁ , Hua Mei ₁ , Yan Xu _{1,

2}

Affiliation

Designing and synthesizing lanthanide clusters have always been a research hotspot. Herein, three lanthanide clusters with the formula [Ln₈(IN)₁₄(μ₃-OH)₈(μ₂-OH)₂(H₂O)₈]·xH₂O (Ln = 1-Gd and x = 11; Ln = 2-Dy and x = 8; Ln = 3-Eu and x = 8) have been isolated in the presence of isonicotinic acid under solvothermal conditions. Structural analysis indicates that those three compounds are isostructural, featuring boat-shaped {Ln₈} metal frameworks. Magnetic measurements reveal that 1-Gd exhibits a larger MCE with the maximum −ΔS_m value of 31.77 J kg⁻¹ K⁻¹ at 2 K for ΔH = 7 T, while 2-Dy displays slow magnetization relaxation. Besides, the photoluminescence properties of 3-Eu were investigated.

中文翻译：

具有磁热效应和缓慢磁弛豫的新型船形Ln8簇

镧系元素簇的设计和合成一直是研究热点。在此，三个镧系元素簇的分子式为 [Ln ₈ (IN) ₁₄ (μ ₃ -OH) ₈ (μ ₂ -OH) ₂ (H ₂ O) ₈ ]· x H ₂ O (Ln = 1-Gd和x = 11；Ln = 2-Dy和x = 8；Ln = 3-Eu和x = 8) 已在溶剂热条件下在异烟酸存在下分离。结构分析表明，这三种化合物是同构的，具有船形{Ln₈ } 金属框架。磁性测量表明， 1-Gd表现出更大的 MCE，最大 -Δ S _m值为 31.77 J kg^-1 K^-1在 2 K 时，Δ H = 7 T，而2-Dy显示出缓慢的磁化弛豫。此外，研究了3-Eu的光致发光特性。

更新日期：2021-09-16

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