新型超分子复合发光材料四足配体铕配合物-蒙脱土的插层组装及发光性质

通过离子交换反应将四足配体铕配合物EuL(NO3)]2+L=1,1,1’,1’-四(吡啶-2-羧酸酯基)联三甲基丙烷]插层组装到蒙脱土(MT)层板间, 制备出一种新型的超分子复合发光材料EuL(NO3)]2+-MT. 用元素分析、XRD、FTIR、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d(001)值与插层配离子的直径吻合得较好, 配离子以单层形式分布于蒙脱土层板间. 在紫外光激发下, 复合材料发出较强的Eu3+特征荧光, 其相对荧光强度、荧光单色性和荧光寿命大大优于相应配合物的乙醇溶液. 复合材料中配合物的发光性能、光稳定性和热稳定性较纯配合物有明显提高.

Intercalation Assembly and Luminescent Properties of a Novel Luminescent Supramolecular Composite Material, Eu(Ⅲ) Complex with Tetrapodal Ligand-Montmorillonite

Eu(Ⅲ) complex with tetrapodal ligand, EuL(NO3)]2+L=1,1,1',1'-tetra(2-pyridinecarboxylester)-di(trimethylpropane)] was intercalated into the interlayer space of montmorillonite(MT) by ion exchanging, and a novel luminescent supramolecular composite material EuL(NO3)]2+-MT was obtained. Its composition and structure were characterized by elemental analysis, XRD and FTIR spectra. The luminescent property of the material was also studied. The results show that the intercalation composite material has a regular layered structure and good luminescent property. Under ultraviolet light the material could emit the characteristic red luminescence emission of Eu3+ strongly. The relative luminescence intensity, the monochromaticity and the luminescence lifetime of the Eu(Ⅲ) complex in the composite material are much better than those of the complex dissolved in ethanol solution. It is also found that the luminescent property and the stability of EuL(NO3)]2+ in the composite material are distinctly improved after it is intercalated into the MT. We deduce that the supramolecular interaction between the host layer and the guest complex ion and the rigid layered structure of the material may be the main reasons of this result.