【摘要】 报道了一种简便的制备高荧光性多孔有机聚合物材料的方法,即以1,3,6,8-四溴芘(TBr Py)与硼酸类单体为构筑基元,通过Suzuki偶联反应制备多孔芳香骨架材料LNUs.利用傅里叶变换红外光谱、热重分析、氮气吸附、固体紫外光谱和荧光光谱等分析方法对其结构与性能进行了系统表征.分析结果表明,该类多孔芳香骨架材料具有良好的热化学稳定性和较大的比表面积,所得材料优异的荧光性能使其非常适合用于硝基爆炸物的选择性检测.多孔芳香骨架材料LNUs在苯、溴苯、苯胺、甲苯、氯苯和苯酚等分子存在下,荧光强度基本不变,而在加入硝基苯、对硝基苯酚和对硝基氯苯后,荧光几乎完全猝灭,说明该类材料对硝基苯、对硝基苯酚和对硝基氯苯显示出专一的检测性能.根据这一特性,利用LNUs材料制备了一种新型便携式纸传感器,其可以简便快速实时检测硝基爆炸物,并在痕量检测方面展现出良好的应用前景.更多还原

【Abstract】 Three fluorescent porous aromatic framework materials donated as LNU-9,LNU-10,and LNU-11 were prepared via Suzuki coupling reactions of 1,3,6,8-tetrabromofluorene（ TBrPy） with boric acid monomers. The structures and properties of the LNUs were characterized by Fourier transform infrared spectroscopy（ FTIR）,thermogravimetric analysis（ TGA）,nitrogen adsorption-desorption,solid ultraviolet spectroscopy and fluorescence spectroscopy. The disappearance of vibration peaks at 1349,1144,495 cm^-1 in FTIR spectrum is attributed to the breakage of C—Br and C—B（ OH）₂ bonds,respectively,indicating the complete polymerization of building monomers into porous skeletons. Powder X-ray diffraction（ PXRD） and transmission electron microscopy（ TEM） images reveal all the LNUs have amorphous structure. The thermogravimetric analysis results demonstrate the excellent thermal stability of LNUs. In addition,these materials exhibit high chemical stability,as verified by no dissolution or decomposition in various organic solvents such as methanol,ethanol,tetrahydrofuran,acetone,dichloromethane,chloroform,N,N’-dimethylformamide,dimethylsulfoxide,etc. Besides,their large specific surface areas in the range of 800—1500 m²/g and excellent fluorescence properties make them suitable for the detection of specific nitro explosives. After benzene,bromobenzene,aniline,toluene,chlorobenzene and phenol were added into the methanol solution of LNUs respectively,the luminescence intensity had little change,demonstrating there is no specific interaction between porous skeleton and organic substances. On the contrast,fluorescence of LNUs was almost completely quenched in the respective solution of nitrobenzene,p-nitrophenol,and p-nitrochlorobenzene,indicating the selective detection capability for nitro compounds of the LNUs. Based on these results,we prepared a novel portable paper sensor which realized the facile and rapid real-time detection of nitro explosives,demonstrating an impressive prospect in trace detection.更多还原