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将传感元素芘经由柔性长臂——丙二胺和3-缩水甘油丙醚基三甲氧基硅烷化学结合于石英玻片表面,得到一种新型光致发光薄膜材料.研究表明,不论在湿态还是在干态,该薄膜均具有芘单体及其激基缔合物的荧光发射特征.通过静态荧光和时间分辨荧光光谱研究,发现激基缔合物荧光发射主要来自于基态二聚体直接激发所形成激基缔合物.激基缔合物结构包含具有“三明治”结构的正常激基缔合物和部分重叠的变形激基缔合物结构.乙二酸、丙二酸、丁二酸等二元羧酸的存在对固定化芘的单体和激基缔合物的荧光发射均表现出敏化作用,但敏化达到平衡所需要的时间因二元羧酸链长的不同而不同.一般来讲,二元羧酸的链长越长,平衡所需时间越长。二元羧酸敏化作用对时间的依赖性被归因于分子链插入所引起的薄膜表面固定化传感元素(荧光活性小分子)空间分布的改变.以甲酸或乙酸代替二元羧酸进行实验并未发现类似的敏化作用.实验所得功能薄膜对二元羧酸的响应具有良好的可逆性.
The sensing element pyrene is chemically bound to the surface of the quartz glass slide via the flexible long arm-propylenediamine and 3-glycidyl ether trimethoxysilane to obtain a novel photoluminescent film material. State or dry state, the film has the pyrene monomer and excimer complex fluorescence emission characteristics of static fluorescence and time-resolved fluorescence spectroscopy study found that the excimer fluorescence emission mainly from the ground state dimer Directly excite the formed excimer. The excimer structure comprises a normal excimer having a “sandwich” structure and a partially overlapping degenerate excimer structure. The oxalic acid, the malonic acid, the di The presence of dicarboxylic acids such as diacids sensitizes the fluorescence emission of both the monomers and the excimer of the immobilized pyrene, but the time required for the sensitization to reach equilibrium depends on the dicarboxylic acid chain length In general, the longer the chain length of the dicarboxylic acid, the longer it takes to balance. The time-dependent dependence of the dicarboxylic acid sensitization is attributed to the spatial distribution of the immobilized sensing element (fluorescently active small molecule) on the surface of the membrane caused by the insertion of the molecular chain. The substitution of formic acid or acetic acid for the dicarboxylic acid The experiment did not find similar sensitization effect.The experimentally obtained functional film has good reversibility to dicarboxylic acid.