一种多功能荧光识别金属-有机框架化合物的合成及表征

Synthesis and Characterization of a Metal-organic Framework with Multi-functional Luminescent Identification Properties

水热法合成一种结构新颖的配位聚合物:[Zn3(cbda)2(H2O)2]n(H3cbda=1-(3-羧基苄基)苯并咪唑-5,6-二羧酸),运用X-射线单晶衍射、红外光谱、X-射线粉末衍射、热重分析等进行了结构表征;X-射线单晶衍射表明配位聚合物中锌离子采取三角双锥构型和扭曲的八面体构型,基于两种构型形成了{ZnO5}和{ZnO4N2}两种结构单元,通过共价键将两种结构单元有序联结,进而组装成为三维空间结构;荧光性能测试表明配位聚合物对色氨酸、硝基苯和Fe3+具有良好的荧光识别性能.

One metal-organic framework （MOF）, namely, [Zn3 （cbda）2 （H2 0）2 ]n（H3cbda = 1 （3-carboxylbenzyl） benzimidazole-5,6-dicarboxylic acid） has been synthesized under hydrothermal method and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra, thermogravimetric （TG） analysis, and powder X-ray diffraction （PXRD）. Single-crystal X-ray diffraction analysis indicates that Zn（ Ⅱ ） centers adopt distorted octahedral configurations and trigonal bipyramid configurations containing { ZnO5 } and { ZnO4N2 } building units in the as-synthesized coordination polymer. Structural analysis reveals that the title coordination polymer exhibits a three-dimensional architecture through covalent bonds. Furthermore, the photoluminescence properties of the coordination polymer were investigated in the solid state and various solvent systems. The remarkable character is that the coordination polymer demonstrates highly selective and sensitive recognition for nitrobenzene, tryptophan and Fe^3＋ ion.