A new family of dinuclear lanthanide complexes exhibiting luminescence, magnetic entropy changes and single molecule magnet behaviors
A new family of dinuclear lanthanide complexes exhibiting luminescence, magnetic entropy changes and single molecule magnet behaviors
复制标题
具有发光、磁熵变化和单分子磁行为的双核稀土配合物的新家族
DOI：
10.1039/d0ce01477j
复制
发表时间：
2021-01-21
期刊：
影响因子：
3.1
通讯作者：
Zhang, Shi-Yong
中科院分区：
文献类型：
--
作者：
Dong, Lu;Lu, Ying-Bing;Zhang, Shi-Yong
以四唑-1-乙酸酯配体和1,10-菲罗啉共配体为基础合成了一类新的镧系配合物，并通过红外光谱、热重分析、粉末x射线衍射和单晶x射线衍射对其进行了表征，其分子式为[Ln2(μ-Cl)2(1-tza)2(phen)4](ClO4)2 [Ln = Eu (1), Tb (2), Gd (3), Dy (4)；1- htza =四唑-1-乙酸酯，phen = 1,10-菲罗啉]。它们呈现出由μ-COO−1-tza和μ-Cl−混合桥接的双核结构。1和2的固态发光发射特性表现为Ln阳离子的特征发射带，寿命分别为1.49 ms和0.20 ms。磁性研究表明，当ΔH = 5t时，3在3k时表现出−ΔSmmax = 18.5 J kg−1 K−1的磁热效应，而4表现出15.19 K的单分子磁性行为。
A new family of lanthanide complexes based on a tetrazole-1-acetate ligand and a 1,10-phenanthroline co-ligand were synthesized and characterized by IR spectroscopy, thermogravimetric analyses, powder X-ray diffraction and single-crystal X-ray diffraction, and their formula is [Ln2(μ-Cl)2(1-tza)2(phen)4](ClO4)2 [Ln = Eu (1), Tb (2), Gd (3), Dy (4); 1-Htza = tetrazole-1-acetate, phen = 1,10-phenanthroline]. They show dinuclear structures bridged by mixed μ-COO−1-tza and μ-Cl−. The solid-state luminescence emission properties of 1 and 2 exhibit the characteristic emission bands of Ln cations with a lifetime of 1.49 ms and 0.20 ms, respectively. Magnetic studies reveal that 3 shows a magnetocaloric effect with −ΔSmmax = 18.5 J kg−1 K−1 at 3 K for ΔH = 5 T and 4 displays a single-molecule magnet behaviour with Ueff of 15.19 K.