四足配体铽配合物-蒙脱土超分子复合发光材料的插层组装、表征和性质研究  

Intercalation Assembly,Characterization and Luminescent Properties of Novel Supramolecular Composite Materials,Tb(Ⅲ) Complex with Tetrapodal Ligand-Montmorillonite

作　　者：蒋维[1] 唐瑜[1] 徐丽[1] 刘伟生[1] 谭民裕[1] 

机构地区：[1]兰州大学化学化工学院

出　　处：《中国稀土学报》2006年第5期534-539,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(20401008)

摘　　要：用两种方法分别将四足配体铽配合物[TbL(NO3)]2+和[TbL]3+插层组装到了蒙脱土(MT)层板间,制备出超分子复合发光材料[TbL(NO3)]2+-MT和[TbL]3+-MT。方法一:通过离子交换反应让配离子[TbL(NO3)]2+取代钠基蒙脱土(Na-MT)中的Na+离子,插层组装到蒙脱土层板间。方法二:用配体L与铽基蒙脱土(Tb-MT)反应,使配体插入蒙脱土层板间与Tb3+离子配位。用元素分析、XRD,FT-IR,UV-vis和热分析对材料进行了表征,并对其荧光性质进行了研究。结果表明,复合材料保持了蒙脱土良好的层柱结构特征,其层间距d001值与插层配离子的直径吻合较好,配离子以单层形式分布于蒙脱土层板间,复合材料中配合物的热稳定性有明显提高。在紫外光激发下,复合材料发出较强的Tb3+特征荧光,其发射光谱与相应配合物的发射光谱很相似;复合材料中配合物的相对荧光强度较相应纯配合物有明显提高,荧光寿命较长;配合物的激发波长向可见光区发生位移,说明插层组装实现了对配合物激发波长的调制作用。Two kinds of Tb（Ⅲ） complexes with tetrapodal ligand, [TbL（NO3）]3^＋ and [TbL]^3＋ （L： 1,1,1＇, 1 ＇-tera （ 2-pyridinecarboxylester ）-di （ trimethylpropane）） were intercalated into the interlayer space of montmorillonite （MT） by ion exchange and coordination reaction of L with the Tb^3＋ion existing in the interlayer space of Tb-MT respectively. The obtained luminescent supramolecular composite materials, [ TbL （NO3）]^2＋-MT and [TbL]^3＋-MT were characterized by elemental analysis, XRD, FT-IR, UV-vis and thermal analysis. At the same time, the luminescent properties of the materials were also studied. The results show that the intercalated materials with regular layered structure, good thermal stability and the interlayer spacing （ d001 ） approximates to the size of the complex ions which are located in the interlayer space of MT in the form of a monolayer. The material emit characteristic green emission of Tb^3＋ strongly under excitation of ultraviolet light. It is also found that the thermal stabilities and relative luminescence intensities of the Tb^3 ＋ species are distinctly improved ＇after the Tb （Ⅲ） complexes are intercalated into the MT. The excitation wavelengths of the complexes are modulated to red shift in the composite materials.

关 键 词：四足配体铽配合物 蒙脱土 超分子复合发光材料 插层组装 荧光性质 稀土 

分 类 号：O614.33[理学—无机化学]