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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Photoluminescence Properties of Lanthanide-Organic Frameworks (LnOFs) with Thiophene-2,5-Dicarboxylate and Acetate
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Photoluminescence Properties of Lanthanide-Organic Frameworks (LnOFs) with Thiophene-2,5-Dicarboxylate and Acetate

机译:用噻吩-2,5-二羧酸酯和乙酸乙酯的镧系元素 - 有机骨架(LNOFS)的光致发光性质

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摘要

S-heterocyclic dicarboxylic acid, thiophene-2,5-dicarboxylic acid (H2TDC), was employed to construct a series of lanthanide-organic frameworks (LnOFs) with coligand acetate, formulated as [Ln(TDC)(OAc)(H2O)](n) [Ln = Eu (1), Tb (2), Gd (3), Dy (4), Sm (5)] under hydrothermal conditions. Structure analysis reveals that 1-5 have dinuclear 3D metal organic frameworks (MOFs), in which TDC2- and OAc- display (kappa(1)-kappa(1))-(kappa(1)-kappa(1))-mu(1) and (kappa(2)-kappa(1))-mu(2) coordination fashions, respectively. The dehydrated products of all compounds show high thermal stability above 410 degrees C. As for 1, 2, 4, and 5, the photoluminescence analyses exhibit characteristic luminescence emission bands of the corresponding lanthanide ions in the visible region. In particular, compound 2 displays bright green luminescence in the solid state with D-5(4) lifetime of 0.510 ms and relative high overall quantum yield of 16%, based on an ideal energy gap between the lowest triplet state energy level of H2TDC ligand and the D-5(4) state energy level of Tb3+. The energy transfer mechanisms in compounds 1 and 2 were also discussed.
机译:使用S-杂环二羧酸,噻吩-2,5-二羧酸(H2TDC),用Coligand和Coligand和醋酸盐构建一系列镧系元素 - 有机骨架(LNOF),配制为[LN(TDC)(OAC)(H2O)] (n)[Ln = Eu(1),Tb(2),Gd(3),Dy(4),Sm(5)]在水热条件下。结构分析表明,1-5具有硫赤3D金属有机框架(MOF),其中TDC2和OAC-显示器(Kappa(1)-Kappa(1)) - (kappa(1)-kappa(1)) - mu (1)和(kappa(2)-kappa(1)) - mu(2)分别协调时装。所有化合物的脱水产物显示出高于410℃的高热稳定性。如图1,2,4和5所示,光致发光分析在可见区域中表现出相应的镧系元素的特征发光带。特别地,化合物2在具有0.510ms的D-5(4)毫秒的固态中显示亮绿色发光,并且基于H2TDC配体的最低三重态能水平之间的理想能差,相对高的总量子产率为16%和D-5(4)TB3 +的状态能级。还讨论了化合物1和2中的能量转移机制。

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