高荧光性含锌类水滑石研究  

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

作　　者：陈鸿[1] 章文贡[1] 

机构地区：[1]福建师范大学化学与材料学院高分子研究所,福州350007

出　　处：《化学学报》2008年第4期481-486,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.50272014);福建省自然科学基金重大项目(No.2001F005);福建省纳米重大专项(No.2005HZ01-5)资助项目

摘　　要：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(501nm),荧光强度高达4.5×105a.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.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 Zn^2＋ 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 Zn^2＋ 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.

关 键 词：类水滑石 荧光 8-羟基喹啉锌 插层 组装 超分子 

分 类 号：O611.3[理学—无机化学]