苯并噻唑螺萘并噁嗪类化合物的微波合成与性质

以苯并噻唑衍生物、1-亚硝基-2-萘酚为原料,三乙胺为催化剂,无水乙醇为溶剂,采用微波辐射法合成了苯并噻唑螺萘并噁嗪光致变色化合物.通过元素分析,IR,MS,1H NMR对结构进行了表征,并用紫外分光仪研究了溶剂效应和荧光分光光度计研究了荧光效应,结果表明该类化合物具有较好的荧光性能,其开环体的λmax与溶剂的极性常数呈较好的线形相关性.     

含萘直链多胺化合物的荧光pH效应及核苷磷酸盐的分子识别

合成了三种含萘但链长不同的多胺类化合物.研究了它们在不同pH条件下的荧光光谱，发现所研究化合物的荧光强度与pH值间有着强烈的依赖关系，因此这类化合物可用作测定溶液pH值的荧光探针.在上述化合物溶液中分别引入不同的核苷磷酸盐（ATP、ADP、AMP），发现所研究的化合物如N-(2-氨乙基)-N’-（2-[(1-萘甲基)氨乙基]）乙二胺(化合物3)，其荧光可被不同的核苷磷酸盐所猝灭.以Stern-Volmer常数（KSV）或猝灭常数（Kq）作为评估猝灭能力大小的标准表明,不同核苷磷酸盐的猝灭能力是各不相同的.其中ATP有着对化合物3荧光最大的猝灭功能.实验结果表明,分子尺寸的匹配和化合物中基团的空间合理排布是化合物和核苷磷酸盐间能发生相互作用的重要根据,而猝灭则强烈地依赖于这类物种间的相互作用,因此可利用化合物荧光强度的改变来识别各种不同的核苷磷酸盐.     

含吡啶环的芳香醚-噁二唑类化合物的合成及其光谱研究

为开发新的高强度的有机电致发光材料, 用含烷氧基的取代苯甲酸(2)与2,6-吡啶二甲酰肼(3)在POCl3作用下, “一锅煮”法合成6个结构对称的含吡啶环的芳香醚-噁二唑4a～4f. 通过MS, IR, 1H NMR, 元素分析等手段对其结构进行了表征. 化合物的荧光性能测定结果显示此类化合物具有良好的荧光性, 其荧光发射波长均在347～507 nm范围内, 最大荧光发射波长在384 nm附近处, 且荧光强度较强. 在芳环上引入5-Br基团(4e, 4f), 化合物的荧光发射波长发生红移, 荧光强度有所减弱. 以硫酸奎宁作参比, 测定6个目标产物的荧光量子产率, 5-Br基团的引入对荧光量子产率没有明显影响. 同时讨论了代表性产物4a在不同溶剂中最大荧光激发波长处的荧光量子产率, 发现溶剂极性对该类化合物的荧光量子产率基本没有影响.     

DYNAMIC TOTAL FLUORESCENCE AND ANISOTROPY DECAY STUDY OF THE DANSYL FLUOROPHOR IN MODEL COMPOUNDS AND ENZYMES

Abstract— The fluorescence of the dansyl group, covalently bound to lysine or tyrosine, was studied in model compounds and enzymes. The fluorescence lifetime of the model compounds strongly depends on solvent polarity and is different for the sulfonamide or sulfate binding type. These compounds rotate as spheres having radii corresponding to the molecules'dimensions. For the enzymes, we found a biexponential total fluorescence decay, because the dansyl groups were either located at two different lysines or bound to oxygen and nitrogen of the same tyrosine, the label always being surrounded by water. Dynamic fluorescence depolarization measurements showed, that the label rotates freely and fast relative to the protein which behaves as a sphere. In a peptide, however, some amino acids rotate together with the label.     

Fluorescence sensors for Cu2+ based on conjugated indole Schiff base

Two new conjugated Schiff bases were prepared by condensation reactions between indole derivatives and o-phenylenediamine, respectively. The structures of the synthetic compounds were characterized by IR, ¹H NMR, and elemental analysis. And the melting point determination revealed that both compounds have good thermal stability. Their fluorescence measurements indicated that both compounds in solution have excellent performance on fluorescence emission, and the intensity of fluorescence emissions was quenched sharply by adding copper (II) nitrate. And the spectral changes were examined upon addition of various metal ions, such as Cu²⁺, Cd²⁺, Co²⁺, Ni²⁺, and Zn²⁺. The results indicated that the fluorescence intensity of two compounds quenched dramatically, and the quenching efficiency of Cu²⁺ was the highest.     

Two Dehydroabietic Acid-based Arylamines: Synthesis, Crystal Structure and Fluorescent Properties

Two dehydroabietic acid-based arylamines have been synthesized and characterized by FTIR, 1H NMR, 13C NMR, MS spectra and elemental analysis. Their spatial structures were determined by X-ray diffraction analysis. UV-Vis absorption and fluorescence spectral characteristics of these compounds in methanol were investigated. Their fluorescence emission spectra in different polarity solvents were further evaluated. Fluorescent properties and structural relationship of the compounds showed that fluorescence intensity and quantum yield inversely increase with the non-coplanar degree. In addition, the solvent polarity has different effects on the fluorescence emission spectra of two compounds.     

以吖啶染料荧光猝灭为基础的卤素阴离子检测研究

合成了两种吖啶及吖啶橙盐类小分子化合物和带有吖啶盐的三元共聚物.研究了它们在溶液中的荧光被卤素离子猝灭的问题.发现它们能强烈地被碘离子所猝灭而不易被氯离子猝灭,表明这类化合物有可能用于在有氯离子存在条件下对碘、溴离子的检测.对荧光猝灭机理进行的研究发现,卤素离子的猝灭能力并不和它们对发光化合物的系间窜越和三重态的生成等有关,而是和阴离子对极化分子的作用减弱了分子内的电荷转移能力相关.     

用荧光光谱法研究OLED用的新型蓝色发光染料和三-（8-羟基喹啉）铝(AlQ_3)的光诱导电子转移和激基复合物的生成

在合成了三种新型发射蓝光化合物的基础上，对它们在溶液中的光物理行为作 了详细研究。发现它们的荧光能强烈地被三-（8-羟基喹啉）铝所猝灭，并在荧光 光谱的长谱部分出现因发生光诱导电子转移而生成激基复合物的发光。几个方面的 工作-如猝灭常数的测定，电子转移过程自由能的计算，都表明化合物荧光猝灭过 程的电子转移性质。此外，还讨论了因出现光诱导电子转移和激基复合物给OLED器 件带来的影响，特别对三种作为器件发射蓝光化合物的优劣进行了讨论，表明化合 物DPF有着最佳的发光特征。     

2,5-二取代噁二唑的研究

本文合成了二十六种2-苯基和2-取代苯基-5-(4'-联苯基)噁二唑化合物,测定了这些化合物的熔点、紫外吸收光谱、荧光发射光谱、荧光量子产率和激光转换效率。其中十七种化合物在近紫外区有较高的激光转换效率。     

2-(取代苯乙烯基)-5-取代苯并噁唑的合成及其光性能的研究

通过2-甲基苯并噁唑或2-甲基-5-叔丁基苯并噁唑在KOH/DMF介质中与苯甲醛或取代苯甲醛反应,合成了22个标题化合物,其中13个未见报道。测定了它们的结构和紫外光谱、荧光光谱、荧光量子产率,并对母体化合物的溶剂效应进行了研究。