稀土金属-有机骨架材料的合成及荧光性质

Synthesis and Fluorescence Properties of Rare Earth Metal-Organic Materials

以Dy(Ⅲ)为金属中心,对苯二甲酸为配体,CTAB为模板,辅助合成了具备不同尺寸和形貌的[Dy_2(BDC)_3(H_2O)_4]_n晶体,采用X射线衍射、扫描电镜对该样品的结构和形貌进行了表征。结果表明:所获得产物就是目标产物;通过控制模板剂的用量,能够有效调控样品的尺寸和形貌。室温下,样品发射Dy^(3+)的特征荧光,硝基苯和邻硝基甲苯会对样品的荧光产生较强的猝灭作用,并且具有响应速度快、敏感性强的特点。硝基苯的加入量由0增加到4μL时(v/v为0-2‰),荧光强度降低16%,当硝基苯加入量增加到32μL时(v/v为16‰)样品的荧光发生猝灭现象;邻硝基甲苯加入量由0增加到4μL时(v/v为0-2‰),荧光强度降低12%,当邻硝基甲苯加入量为48μL时(v/v为24‰),样品的荧光发生猝灭现象。

One novel [ Dy2 （ BDC ） 3 （ H2O ） 4 ] n crystals with different sizes and shapes constructed by Dy （III） ions and terephthalic acid were synthesized by using a surfactant-assisted method. The samples were characterized by XRD, SEM. The results indicated that the target products were obtained. In addition, scan electron microscopy （SEM） imaged of crystals revealed that size and shape of crystals can be tuned by varying the dosage of surfactant. At ambient temperature, compound exhibits characteristic emissions of Dy （III） ion, fluorescence quenching was produced by the addition of nitrobenzene and adjacent nitrotolu- ene. Upon increasing the volume of nitrobenzene from 0 to 4 μL（ v/v is 0 -2‰） , corresponding to the e- mission intensity decreased gradually 16%, a significant fluorescence quenching effect was observed when 32 μL nitrobenzene was added. Increasing the volume of adjacent nitrotoluene from 0 to 4 μL（ v/v is 0 - 2‰v） ,corresponding to the emission intensity decreased gradually from approximately 12% , a significant fluorescence quenching effect was observed when 48 μL nitrobenzene was added.