Akhtar Muhammad Nadeem, Chen Yan-Cong, AlDamen Murad A, Tong Ming-Liang
Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Department of Chemistry, Faculty of Science, the University of Jordan, Amman 11942, Jordan.
Dalton Trans. 2016 Dec 20;46(1):116-124. doi: 10.1039/c6dt03843c.
Four isostructural 3D lanthanide(iii) metal-organic frameworks with the general formula (Hedte)[Ln(ox)(HO)] (Ln = Gd (1), Tb (2), Dy (3) and Ho (4); Hedte = N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine) and ox = oxalate have been synthesized from oxalate. These compounds were characterized using single-crystal X-ray diffraction, FTIR and TGA/DTG. The magnetic investigation has been performed for 1-4 and the results reveal that a Gd(iii) containing MOF has the highest magnetic density and exhibits a larger cryogenic magnetocaloric effect (ΔS = 35.9 J kg K for ΔH = 9 T at 2.0 K) with a high Debye temperature (θ = 342(3) and r = 35). For the Dy derivative, an ac-out-of-phase signal was found, and further measurements under an applied field of 1000 Oe showed frequency-dependent out-of-phase magnetic susceptibility. Solid-state luminescence indicates that Tb and Dy-containing complexes are photoluminescent materials.
已经从草酸盐合成了四种具有通式(Hedte)[Ln(ox)(H₂O)]（Ln = Gd (1)、Tb (2)、Dy (3) 和 Ho (4)；Hedte = N,N,N',N'-四(2-羟乙基)乙二胺）且 ox = 草酸盐的同构三维镧系(iii)金属有机框架。使用单晶X射线衍射、傅里叶变换红外光谱和热重分析/微商热重分析对这些化合物进行了表征。对1-4进行了磁性研究，结果表明含Gd(iii)的金属有机框架具有最高的磁密度，并在2.0 K时对于ΔH = 9 T表现出较大的低温磁热效应(ΔS = 35.9 J kg⁻¹ K⁻¹)以及高德拜温度(θ = 342(3) K和r = 35)。对于Dy衍生物，发现了交流异相信号，并且在1000 Oe的外加磁场下的进一步测量显示出频率依赖的异相磁化率。固态发光表明含Tb和Dy的配合物是光致发光材料。
