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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (4): 481-486. 上一篇    下一篇

研究论文

高荧光性含锌类水滑石研究

陈鸿, 章文贡*   

  1. (福建师范大学化学与材料学院高分子研究所 福州 350007)
  • 投稿日期:2007-06-29 修回日期:2007-09-27 发布日期:2008-02-28
  • 通讯作者: 章文贡

Study on the Strong-fluorescent Zn-containing Hydrotalcite-like Compound

CHEN Hong; ZHANG Wen-Gong*   

  1. (The Institute of Polymer Science, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007)
  • Received:2007-06-29 Revised:2007-09-27 Published:2008-02-28
  • Contact: ZHANG Wen-gong

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706

被引次数

29 | 4

本研究将适量锌离子(II)取代镁铝水滑石中的镁离子(II), 以及将一定量的8-羟基喹啉(8-hydroxyquinoline)分散于镁铝水滑石层间的亲油性阴离子中, 使与其板层表面上的锌离子配位, 经共沉淀法, 合成、组装得到一类迄今未见报道的具高荧光性的类水滑石(Zn-HTLC)荧光材料. 采用荧光光谱、红外光谱、紫外光谱、X射线衍射和热分析等对其进行了表征. 研究表明, 这种类水滑石在紫外光下可发出强烈的蓝绿色荧光(501 nm), 荧光强度高达4.5×105 a.u., 说明锌离子(II)分散于类水滑石的氢氧化镁板层中, 可有效防止发光结构单元的荧光猝灭, 而且溶于层间阴离子中的配体与板层上的锌离子(II)配位所形成的特殊组装结构, 增强了发光中心的不对称性, 也是其具有高荧光性的可能原因. 热分析结果显示, 这种类水滑石耐热性强, 有望应用于各种功能性荧光材料.

关键词: 类水滑石, 荧光, 8-羟基喹啉锌, 插层, 组装, 超分子

A hydrotalcite-like compound in which magnesium(II) was partially substituted by zinc(II) in the hydrotalcite-like layers and 8-hydroxyquinoline was dispersed into the anions in the interlayer region was synthesized by a coprecipitation method. Each Zn2＋ ion in the layers was coordinated by 8-hydroxyquino- line through the oxygen and nitrogen atoms, making a strong-fluorescent Zn-containing hydrotalcite-like compound (Zn-HTLC) that has never been reported before. The sample has been characterized by X-ray powder diffraction, FT-IR techniques, thermogravimetric analysis, UV/Vis spectrography, fluorescence spectrum, and its composition and structure were determined. It was found that the Zn-HTLC could radiate strong light (501 nm) under ultraviolet radiation, demonstrating that the zinc(II) dispersed in the hydrotalcite-like layers can prevent the fluorescence quenching effect efficiently. The Zn2＋ ion in the layers was coordinated by the ligand in the interlayer region, forming a special self-assembly structure that may enhance the fluorescence intensity. Otherwise, the result of TG-DSC measurement clearly shows the enhanced thermal stability of the Zn-HTLC compared with that of Mg-Al hydrotalcite. The Zn-HTLC may become a promising candidate for the luminescent functional materials.

Key words: hydrotalcite-like compound, fluorescence, 8-quinolinolato zinc, intercalation, assembly, supramolecule