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A Series of Lanthanide Metal-Organic Frameworks with Interesting Adjustable Photoluminescence Constructed by Helical Chains

机译:一系列由螺旋链构成的具有可调光致发光作用的镧系金属有机骨架

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摘要

Based on the isonicotinic acid (HIN=pyridine-4-carboxylic acid), seven lanthanide metal-organic frameworks (MOFs) with the formula [Ln(IN)(2)L] (Ln=Eu (1), Tb (2), Er (3), Dy (4), Ho (5), Gd (6), La (7), L=OCH2CH2OH) have been synthesized by mixing Ln(2)O(3) with HIN under solvothermal conditions, and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, infrared spectroscopy, and fluorescence spectroscopy. Crystal structural analysis shows that compounds 1-6 are isostructural, crystallize in a chiral space group P2(1)2(1)2(1), whereas compound 7 crystallizes in space group C2/c. Nevertheless, they all consist of new intertwined chains. Simultaneously, on the basis of the above-mentioned compounds, we have realized a rational design strategy to form the doped Ln MOFs [(EuxTb1-x)(IN)(2)L] (x=0.35 (8), x=0.19 (9), x=0.06 (10)) by utilizing Tb-III as the second rare-earth metal. Interestingly, the photoluminescence of [(EuxTb1-x)(IN)(2)L] are not only adjustable by the ratios of Eu/Tb, but also temperature or excitation wavelength.
机译:基于异烟酸(HIN =吡啶-4-羧酸),七个具有式[Ln(IN)(2)L]的镧系金属-有机骨架(MOF)(Ln = Eu(1),Tb(2) ,Er(3),Dy(4),Ho(5),Gd(6),La(7),L = OCH2CH2OH)已通过在溶剂热条件下将Ln(2)O(3)与HIN混合而合成,并且其特征在于单晶X射线衍射,粉末X射线衍射,红外光谱和荧光光谱。晶体结构分析表明,化合物1-6是同构结构,在手性空间群P2(1)2(1)2(1)中结晶,而化合物7在空间群C2 / c中结晶。然而,它们都由新的交错链组成。同时,在上述化合物的基础上,我们实现了一种合理的设计策略,以形成掺杂的Ln MOF [(EuxTb1-x)(IN)(2)L](x = 0.35(8),x = 0.19 (9),x = 0.06(10))是利用Tb-III作为第二稀土金属。有趣的是,[(EuxTb1-x)(IN)(2)L]的光致发光不仅可以通过Eu / Tb的比例进行调节,而且还可以通过温度或激发波长进行调节。

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