Towards full-color-tunable emission of two component Eu(III)-doped Gd(III) coordination frameworks by the variation of excitation light.
Towards full-color-tunable emission of two component Eu(III)-doped Gd(III) coordination frameworks by the variation of excitation light.
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DOI：
10.1039/c4dt00837e
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发表时间：
2014-07
影响因子：
4
通讯作者：
Fengming Zhang;Pengfei Yan;Hongfeng Li;X. Zou;Guangfeng Hou;Guangming Li
中科院分区：
文献类型：
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作者：
Fengming Zhang;Pengfei Yan;Hongfeng Li;X. Zou;Guangfeng Hou;Guangming Li
在NaOH存在下，通过Ln（NO3）3·6 H2O与H4 pztc反应，合成了一系列吡嗪-2，3，5，6-四羧酸碱-镧系配位化合物[NaLn（pztc）（H2O）3]·H2O [Ln = Ce（），Sm（），Eu（），Gd（），Tb（）; H4 pztc =吡嗪-2，3，5，6-四羧酸]。X-射线晶体学分析表明，配合物具有同构结构，具有独特的（4（11）·6（8）·8（2））（4（3）·6（2）·8）（4（3））拓扑结构，其中配体表现出新颖的μ7-配位模式。固态光致发光（PL）光谱表明，配合物分别具有Sm（iii）、Eu（iii）和Tb（iii）离子的特征发光，配合物在400-650 nm（λmax = 505 nm）范围内有一个较宽的发光带，与自由配体相比，该发光带红移约103 nm，并有增强效应。此外，通过激发波长的变化，同构双组分Eu（iii）掺杂Gd（iii）配合物实现了从红色到黄色、白色、绿色和蓝色的颜色可调发光。它们代表了镧系配位框架中通过激发光的变化实现全色可调谐发射的第一个例子。
A series of pyrazine-2,3,5,6-tetracarboxylate alkali-lanthanide coordination frameworks, namely [NaLn(pztc)(H2O)3]·H2O [Ln = Ce (), Sm (), Eu (), Gd () and Tb (); H4pztc = pyrazine-2,3,5,6-tetracarboxylic acid], have been synthesized by reacting Ln(NO3)3·6H2O with H4pztc in the presence of NaOH at room temperature. X-ray crystallographic analysis reveals that complexes are isostructural, featuring three-dimensional (3D) networks with a unique (4(11)·6(8)·8(2))(4(3)·6(2)·8)(4(3)) topology in which the ligand displays a novel μ7-coordination mode. The photoluminescence (PL) spectra in the solid state reveal that complexes , and exhibit the characteristic luminescence of Sm(iii), Eu(iii) and Tb(iii) ions, respectively, while complex displays a broad band in the range of 400-650 nm (λmax = 505 nm) which exhibits about 103 nm red-shift and enhancement compared to the band of the free ligand. Further, the isostructural two-component Eu(iii)-doped Gd(iii) complexes realize color-tunable luminescence from red to yellow, white, green and blue by the variation of excitation wavelengths. They represent the first example of full-color-tunable emission in lanthanide coordination frameworks by the variation of excitation light.