Two novel europium coordination polymers based on fluorine substituted and similar carboxylate ligands: Syntheses, structures and luminescence
Two novel europium coordination polymers based on fluorine substituted and similar carboxylate ligands: Syntheses, structures and luminescence
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两种基于氟取代和类似羧酸盐配体的新型铕配位聚合物：合成、结构和发光
DOI：
10.1016/j.inoche.2016.10.003
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发表时间：
2016-11-01
影响因子：
3.8
通讯作者：
Wang, Li-Ya
中科院分区：
文献类型：
--
作者：
Feng, Xun;Sun, Yi-Ling;Wang, Li-Ya
在水热条件下合成了两个具有类似铕-氟取代羧酸盐构造的三维铕金属有机骨架，{[Eu-4(Mimda)(4) (Tfpa)(2)中心点4H(2)O]}(n)(1)和{[Eu-4(Pimda)(4) (Tfpa)(2)中心点4H(2)O]}(n) (2) (Mimda = 2-甲基- 1h -咪唑- 4,5 -二羧酸，Pimda = 2-丙基- 1h -咪唑- 4,5 -二羧酸和Tfpa =（3,4,5,6-四氟-1,2邻苯二甲酸）。通过元素分析、红外光谱和PXRD谱图对其进行了系统的表征。单晶x射线衍射分析表明，每种聚合物都具有无限的棒状链，由双核eu -羧酸盐构建单元组成，这些单元由咪唑-二羧酸盐配体进一步支撑，形成三维开放的非互穿框架，具有（6,4）连接的伪原始立方（pcu）拓扑结构。由于能量从取代的二羧酸配体转移到固态的Eu（III）离子，这两种聚合物都表现出有效的敏化红光。聚合物1也显示出可调谐或可切换的荧光信号，以响应不同的溶剂。此外，发光强度。N，N-二乙基甲酰胺（DMF）悬浮液中Pb2+离子浓度的增加使1呈线性增加，Cd2+离子的加入使1呈下降趋势。(C) 2016 Elsevier B.V.版权所有
Two isostructural 3D europium metal-organic frameworks incorporating similar Eu-fluorine substituted carboxylate tectonics, {[Eu-4(Mimda)(4) (Tfpa)(2)center dot 4H(2)O]}(n) (1) and {[Eu-4(Pimda)(4) (Tfpa)(2)center dot 4H(2)O]}(n) (2) (Mimda = 2-methyl-1H-imidazole - 4, 5-dicarboxy acid, while Pimda = 2-propy1-1H-imidazole- 4, 5-dicarboxy acid and Tfpa = (3,4,5,6-tetrafluoro-1,2 phthalate acid) have been synthesized under the hydrothermal conditions. They have been systematically characterized by elemental analyses, IR spectra and PXRD pattems. Single crystal X-ray diffraction analysis reveals that each polymer possesses infinite rod-shaped chain consist of dinuclear Eu-carboxylate building units, which are further pillared by imidazole-dicarboxylate ligands to give rise to 3D open non interpenetrated frameworks, featuring a (6, 4)-connected pseudo-primitive cubic (pcu) topology. Both two polymers exhibit efficiently sensitized red luminescence due to an energy transfer from substituted dicarboxylate ligand to Eu(III) ions in solid state. Polymer 1 also demonstrates tunable or switchable fluorescence signals in response to the different solvents. Moreover, the luminescent intensity. of 1 is increased linearly with the increasing concentration of Pb2+ cation in N,N-dirnethyl formamide (DMF) suspension, while shows declining trend with Cd2+ cation being introduced. (C) 2016 Elsevier B.V. All rights reserved.