三维导数荧光光谱总体积积分法同时测定多环芳烃

本文提出了一种运用Monte-Carlo积分求算总荧光强度的三维导数荧光光谱法总体积积分法, 并应用于多环芳烃萘、芘、北的同时测定。结果表明, 三维导数荧光光谱总体积积分法的选择性较三维荧光光谱有进一步的提高, 总体积积分法的灵敏度比常规单点法提高10~20倍。     

三维荧光光谱总体积积分法同时测定维生素B2和B6

运用三维荧光光谱总体积积分法建立了一种测定维生素Ｂ２和Ｂ６的荧光分析新方法，该方法的度较常规峰值法分别提高１３０和３１０倍，同时成功地应用于两者的同时测定。     

岩门秀芽茶叶主要浸出物三维荧光指纹图谱分析

基于三维荧光光谱技术结合荧光区域积分法，研究了岩门秀芽在不同冷泡时间下浸出液样品的三维荧光光谱特征。通过激发扫描获取激发-发射矩阵光谱，识别荧光峰的位置并采用荧光区域积分法计算荧光峰所处区域内荧光强度的积分体积值，以探究岩门秀芽主要浸出物种类及其动态变化规律。研究结果显示，在不同浸泡时间下，岩门秀芽浸出液的三维荧光光谱都会产生明显的瑞利散射和红移现象，其主要浸出物：黄酮及黄酮醇类物质、儿茶素和叶绿素a的含量也在不断地变化。在20 min时，茶叶功效成分的含量保留较高且儿茶素含量较低，为冷泡的最佳饮用时间。该研究为实现基于三维荧光光谱技术快速检测茶叶主要成分和鉴别茶叶种类奠定了基础，也为茶叶的科学浸泡和饮用提供参考。     

胶束溶液中同步荧光法测定苯半[a]芘的研究

在不同胶束溶液中考察了苯并［ａ］芘（Ｂ［ａ］Ｐ）的同步荧光光谱。结果表明，在十二烷基苯磺酸钠胶束溶液中，Ｂ［ａ］Ｐ的检测限可达０．００９３ｎｇ／ｍＬ，方法相对标准偏差为１．７％。用于实际水样的测定，结果满意。     

胶束溶液中同步荧光法测定苯并［a］芘的研究

在不同胶束溶液中考察了苯并［ａ］芘（Ｂ［ａ］Ｐ）的同步荧光光谱。结果表明，在十二烷基苯磺酸钠（ＳＤＢＳ）胶束溶液中，Ｂ［ａ］Ｐ的检测限可达０．００９３ｎｇ／ｍＬ，方法相对标准偏差为１．７％。用于实际水样的测定，结果满意。     

磁效应—偏振—共振同步荧光法同时测定痕量Qu,蒽,Bei

偏振－同步荧光法能有效地抑制同步扫描过程中散射光总水平的影响，外加磁场效应能有效地抑制散射光的波动。二者结合起来用于同时测定Ｑｕ、蒽、Ｂｅｉ，Ｂｅｉ检测限改善近６７倍，该法相对标准偏差小于２．７％。     

不同环境介质中芘的三维荧光光谱研究

本文首次运用三维荧光光谱研究芘在不同环境介质中的荧光特性, 揭示芘的F3/F4反映的是环境有序性介质的形成, 而不是所处环境极性大小的一个量度,F1/F3才是其所处环境极性大小的一个量度, 结果显示芘的三维荧光光谱可以更好地对环境性质进行研究, 将进一步扩大芘的应用范围。     

一些新的芘衍生物的合成及光物理研究

本文合成了一系列新的芘衍生物，用紫外光谱和稳态荧光光谱方法研究了它们的光物理性质。结果表明，取代烷基几乎不影响芘的吸收光谱，而使芘的荧光光谱振动精细结构消失或部分消失；取代甲酰基的芘衍生物的荧光发射强烈依赖于溶剂的性质，极性溶剂中荧光光谱无精细结构，且荧光发射峰随介质极性的增加而红移。     

一种含芘葡萄糖衍生物的合成及其胶凝行为

合成并表征了一种荧光活性小分子胶凝剂——芘磺酰基-丙二胺-葡萄糖(PSDAPG), 考察了其在36种常见溶剂中的胶凝行为. 结果发现, PSDAPG可使其中16种溶剂胶凝. 对癸醇, PSDAPG表现出罕见的超级胶凝能力, 室温下最低胶凝浓度(MGC)达7.0×10-4 g·mL-1. 此外, PSDAPG还是一种既可胶凝水又可胶凝有机溶剂的双性胶凝剂. 扫描电镜(SEM)、傅立叶变换红外光谱(FTIR)、核磁共振(1HNMR)和荧光光谱研究表明,在不同溶剂中, PSDAPG具有不同的聚集结构, 除了芘基之间的疏水π-π堆积作用外, 氢键作用是PSDAPG自发形成三维网络结构的重要驱动力. 实验研究还表明, 溶液态和凝胶态的PSDAPG荧光光谱均同时呈现芘的单体荧光和激基缔合物荧光光谱特征, 但两者的光谱形貌差异显著. 随凝胶的形成, 体系单体荧光发射增强, 激基缔合物荧光发射减弱,表明形成的三维网络结构阻碍了PSDAPG中芘单元的运动性, 使得以Birks途径形成激基缔合物的效率降低.     

胶束体系中测定苯并（α）芘的荧光分光光度法研究：Ⅰ.苯并（α）芘在Trit…

利用非离子表面活性剂存在下的胶束增溶、增敏作用研究并建立了在Ｔｒｉｔｏｎ Ｘ－１００胶束体系中荧光分光光度法测定苯并（α）芘（ＢａＰ）的方法，方法最低检测限为０．００３ｎｇ／ｍｌ，线性范围为０．００５－１０ｎｇ／ｍｌ，方法稳定性好，样品中ＢａＰ同系物菲、芘的量大于ＢａＰ７０－６４０倍时，对测定没有干扰，操作方法简便，快速。     

A Fluorescence Polarization Study of Polyaromatic Hydrocarbons Adsorbed on Colloidal Kaolin

Abstract

The adsorption of a number of polyaromatic hydrocarbons onto aqueous colloidal kaolin was studied. The fluorescence polarization and hence the fluorescence anistropy of the hydrocarbons was measured as a function of their concentrations in aqueous solutions containing the colloid. The fluorescence anisotropy was found to be highest for dilute solutions of polyaromatic hydrocarbons, with often sharp decreases at higher concentrations. More concentrated solutions gave an isotropies similar to those of plain aqueous solutions of the fluorophores. The concentration versus fluorescence anisotropy curves and BET surface area data were used to calculate surface coverage of the colloid by the adsorbed hydrocarbons. Coverage in the range of 1% to 14% of the colloid surface was found at surface saturation for the compounds studied. This suggested that colloidal clays have the potential of transporting polyaromatic hydrocarbons through environmental waters.     

The solid-matrix room-temperature luminescence detection and characterization of polyaromatic hydrocarbons without a heavy atom

A selective and sensitive method to detect polyaromatic hydrocarbons (PAH) using a new solid-matrix room-temperature luminescence technique is presented. The solid-matrix room-temperature fluorescence (SMRTF) and phosphorescence (SMRTP) of PAH can be readily obtained by adsorbing a PAH on Whatman 1PS filter paper. Strong phosphorescence can be detected without adding a heavy atom. Detection limits, ranging from 0.12 to 18 ng, were obtained for several PAH.     

Supercritical Fluid Chromatographic Separations of PAHs Using Methanol Modified Carbon Dioxide Mobile Phase.

An analytical method is described for separating polyaromatic hydrocarbons using modified supercritical carbon dioxide and pure carbon dioxide. The effects of adding methanol in supercritical carbon dioxide mobile phase were studied. The modifier, methanol affected especially in the retentions of polyaromatic hydrocarbons.     

Synthesis,Electronic Properties and WOLED Devices of Planar Phosphorus‐Containing Polycyclic Aromatic Hydrocarbons

We describe the synthesis and the physical properties of polyaromatic hydrocarbons (PAHs) containing a phosphorus atom at the edge. In particular, the impact of the successive addition of aromatic rings on the electronic properties was investigated by experimental (UV/Vis absorption, fluorescence, cyclic voltammetry) and theoretical studies (DFT). The physical properties recorded in solution and in the solid state showed that the P‐containing PAHs exhibit properties expected for an emitter in white organic light‐emitting diodes (WOLEDs).     

Photocoupling Reactions of Haloaromatic Hydrocarbons With Aromatic Compounds——Synthesis and Mechanism

An effective method of synthesizing polyaromatic hydrocarbons with high selectivity was developed through our research work on the photocoupling reactions between several haloaromatic hydrocarbons and aromatic compounds. The structures of polyaromatic hydrocarbons synthesized were determined by IR, UV, ~1H NMR, MS and elemental analysis, and the crystal structure of 3-(1-naphthyl)-coumarin was established by an crystallographic analysis. Further study of the regioselectivity, orientational effect of substituents, solvent effect, sensitizing and quenching effect supported the proposed mechanism of this type of reaction involving election transfer process under excited triplet state.     

Re-examination of the structure of calcichrome (calcion) and its complexation with polyaromatic hydrocarbons in water

A non-cyclic tetrameric structure has been suggested for calcichrome (calcion). This structure is consistent with its mass spectrum, proton NMR spectrum, elemental composition and complexing ability with polyaromatic hydrocarbons in water. The stability constants of the 1:1 complexes formed between calcichrome and seven polyaromatic hydrocarbons in water at room temperature have been measured.     

Determination of polycyclic aromatic hydrocarbons in water samples using high-performance liquid chromatography with amperometric detection

The determination of polycyclic aromatic hydrocarbons (PAHs) using high-performance liquid chromatography (HPLC) with UV and fluorescence detection has been well established. Although most of the PAHs can be detected by these methods, some environmentally important polyaromatic compounds, such as acenaphthylene, do not show fluorescence and can only be determined by UV detection at higher concentrations. A sensitive and selective determination of acenaphthylene, acenaphthene and the six PAHs listed in the TVO, the German drinking water standard, is also possible by amperometric detection following HPLC separation. The method was applied to the determination of PAHs in different water samples after solid-phase extraction (SPE). The efficiency of the amperometric determination was found to be superior to UV detection (λ = 300 nm).     

Isolation of polyaromatic hydrocarbons from whole smoke condensate: A simple two-step procedure

Summary A simple two-step procedure for isolating polyaromatic hydrocarbons from whole smoke condensate has been devised. Preliminary separation of a blue fluorescent zone from whole smoke condensate by preparative thin-layer chromatography yields a crude polyaromatic hydrocarbon fraction. A highly enriched polyaromatic hydrocarbon fraction is obtained by passage through a short Sephadex LH-20/isopropanol column. The isolation procedure and a temperature-programmed gas chromatographic scan can be run in less than eight hours.     

Nucleophilic Diboration Strategy Targeting Diversified 1-Boraphenarene Architectures

1-Boraphenalenes, a class of boron-doped polyaromatic hydrocarbons, were synthesized by nucleophilic diboration reaction of alkynes. Activation of diboron reagents with a highly basic sp²-carbanion results in very fast successive C−B bond formations to construct the boracycle. This methodology is characterized by high chemoselectivity, affording a wide variety of 1-boraphenarenes with diverse polar substituents. The endocyclic boron can be arylated conveniently in one pot, and the peripheral boron is available for various chemical transformations. Highly diastereoselective diboration gives pseudo-enantio-enriched boraphenarene, which emits circularly polarized fluorescence (CPL).