滑石粉.doc

滑石粉.doc02125156222 0625520000650000 分类号学 号密 级 10722 公开高荧光性含锌类水滑石的研究作者姓名指导教师学科门类提交论文日期专业名称学校代码成绩评定规划局 ghgfgf 王 瑛应用化学理学赵维 2010 年6月1 0608024127 Study on the Strong-fluorescent Zn-containing Hydrotalcite-pound 摘要Ⅰ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(501 nm), 荧光强度高达 × ., 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 Abstract I Abstract A hydrotalcite-pound in which magnesium(II)was partially substituted by zinc(II)in thehydrotalcite-like layers and 8-hydroxyquinoline was dispersed into the anions in the interlayer region wassynthesized bya coprecipitation Zn2 + ion in the layers was coordinated by 8-hydroxyquino- line through the oxygen and nitrogen atoms,making a strong-fluorescentZn-containing hydrotalcite-pound (Zn-HTLC) that has never been reported sample has been characterized by X-raypowder diffraction,FT-IR techniques,thermogravimetric analysis,UV/Vis spectrography,fluorescence spectrum,and position and structure were was found that the Zn-HTLC could radiate strong light(501 nm)under ultraviolet radiation,demonstrating that the zinc(II)dispersed in the hydrotal-cite-like layers can prevent the fluorescence quenching effect Zn2 + ion in the layers was co- ordinated by the ligand in the interlayer region,forming a special self-assembly structure that may enhancethe fluorescence ,the result of TG-DSC measurement clearly shows the enhanced ther-mal stability of the Zn-pared with that of Mg-Al Zn-HTLC may e apromising candidate for the luminescent functional materials. Keywords : hydrotalcite-pound;fluorescence;8-quinolinolatozinc;intercalation;assembly; supramolecule