胆酸盐簇集体刚性化微环境的灵敏指示-室温光探针法

胆酸盐是一类生物表面活性剂, 一般含有羟基取代的类固醇骨架, 并有一带负电的尾链, 较为常见的胆酸盐有胆酸钠、 脱氧胆酸钠、 牛磺胆酸钠及牛磺脱氧胆酸钠等. 其分子结构见表1及图1所示.     

非离子表面活性剂Brij35胶束体系中α-溴代萘的室温燐光

建立了非离子表面活性剂Ｂｒｉｊ３５胶束介质中α－溴代萘的燐光分析法，并与十二烷基 硫酸钠ＳＬＳ体系作了比较。方法特点如下：α－溴代萘在低浓度的Ｂｒｉｊ３５胶束溶液中即产生 ＲＴＰ发射，具有良好的分析特性。甲醇、乙醇等的加入，体系不会使燐光达到稳定的时间增长，测量操作简便。ＴｌＮＯ３的存在使背景降低，精密度提高。Ｂｒｉｊ３５体系比 ＳＬＳ体系具有较大 的粘度，较小的丙酮猝灭影响。     

α-溴代萘的无保护性介质流体室温燐光特性

含α－溴代萘（ａ－ＢｒＮｐ）的水溶液仅以Ｎａ２ＳＯ３作化学除氧剂，在仪器光源的照射下，即能很快触发α－ＢｒＮｐ强而稳定的室温光（ＲＴＰ）信号。体系ＲＴＰ性质和所需光诱导的时间对有机试剂的存在及其种类和用量极为敏感。０．５％（Ｖ／Ｖ）乙腈或丙酮的存在所需光照时间短，ＲＴＰ强度高。α－ＢｒＮｐ浓度分别在 １．０ × １０－６～ ２． ４ × １０－５ ｍｏｌ／Ｌ和 ４． ０ × １０－７～ ２． ０ × １０－５ｍｏｌ／Ｌ范围内与 ＲＴＰ强度呈良好线性关系，检出限分别为 ３，８ × １０－８ ｍｏｌ／Ｌ和 ６．５ × １０－８ ｍｏｌ／Ｌ。     

环己烷存在下环糊精诱导a-溴代萘室温燐光

微量环己烷存在下,β-环糊精能诱导α-溴代萘发射强的室温燐光.发光光谱、燐光寿命和荧光偏振的实验证实了β-环糊精一环已烷一α-溴代萘三元包络物的形成.测定了三元包络物的表观形成常数,讨论了环已烷对β-环糊精诱导α-溴代萘室温燐光的影响机制.     

一种新的敏化/猝灭室温燐光法——CTAB胶束中α-溴代萘敏化联乙酰的室温燐光猝灭

本文首次报道了将敏化和猝灭同时偶合在同一体系中的敏化/猝灭室温烘燐新方法.体系中,CTAB胶束一方面增强α-溴代萘的室温燐光发射、α-溴代萘和联乙酰的三重态-三重态能量转移效率,另一方面起到猝灭α-溴代萘敏化联乙酰发射的室温燐光的作用.CTAB对联乙酰的猝灭反应由三重态-三重态能量转移速率限制,求得α-溴代萘敏化联乙酰的三重态-三重态能量转移速率常数为1.76×10~9(mol·dm~(-3)~(-1)S~(-1),CTAB对联乙酰的猝灭常数为7.82×10~7(mol·dm~(-3)~(-1)S~(-1).详细研究了实验条件,实现了猝灭法测定联乙酰,检测限达2.8×10~(-8)mol·dm~(-3).     

β-溴代萘的化学除氧环糊精诱导室温燐光法测定

本文首次成功地建立了以KI或Tl_2SO_4无机盐作重原子,Na_2SO_3作除氧剂,测定β-溴代萘的化学除氧环糊精诱导室温燐光法。该方法比以往用卤代烷烃作重原子吹氮除氧CD-RTP法操作简便。本文详细研究了化学除氧的各种影响条件及方法的适用性。实验表明,以K1作重原子的体系比TI_2SO_4体系有更高的灵敏度和更宽的条件宽容度,而且操作更为简便。目前此种方法还仅适用于含内重原子化合物的测定。     

色氨酸无保护流体室温燐光和胶束增稳室温燐光性质的比较

研究了色氨酸的无保护流体室温燐光和以非离子表面活性剂Tween 20、Tween 40、Tween 80、Tween 85、Brij35、TritonX 100、乳化剂OP及高分子分散剂聚乙二醇 200(PEG 200)、PEG 400为介质的流体室温燐光 性质。直接用于大米、花生、大豆及竹笋中色氨酸的测定,相对标准偏差2.26%～3.28%,与荧光法比较,相 对误差-3.9%～4.2%。     

醇对环糊精/溴代萘超分子组合体系室温燐光的影响

研究了ＣＤ／溴化萘／醇体系的室温燐光发射条件、发光特性和不同醇、不同ＣＤ的影响。认为就本质而言，这类发光体系属一种超分子组合体系。其中，ＣＤ与内含重原子的发光体借助于分子间作用力形成二元包结物；而醇则与ＣＤ端口的羟基形成氢键，其烷基链借助于疏水作用力覆盖在ＣＤ的端口，如同一种疏密不同的盖子，不仅提高了ＣＤ腔内的疏水性，增大了发光体与ＣＤ的结合常数，同时，对外部氧向ＣＤ腔内的扩散起着隔离作用，其效应如同通Ｎ２除氧过程，从而可在不除氧条件下，观察到强的室温磷光发射。由于这类流体室温■光现象，在属性上已超出原有环糊精诱导室温■光范畴，醇的作用属超分子化学中典型的分子调控作用，其主体理应不局限于环糊精，因此建议将其命名为超分子组合室温■光（Ｓｕｐｒａｍｏｌｅｃｕｌａｒ Ａｓｓｅｍｂｌｙ ＲｏｏｍＴｅｍｐｅｒａｔｕｒｅＰｈｏｓｐｈｏｒｅｓｃｅｎｃｅ，简写为 ＳＭ－ＲＴＰ）。     

中草药有效成分葛根素的滤纸表面室温燐光法的研究

选择滤纸作基质，以ＬｉＡｃ作重原子微扰剂，首次成功地建立了测定痕量中草药有效成分葛根素的滤纸基质室温燐光法。本法取样量少（２μＬ），线性范围宽（４．１６～４９９ｎｇ／斑），灵敏度高（检测限为０．１９ｎｇ／斑），操作简便、快速。     

Naphthyl Substituted Impurities Induce Efficient Room Temperature Phosphorescence

Accidentally, it was found that triphenylamine (TPA) from commercial sources shows ultralong yellow-green room temperature phosphorescence (RTP) like commercial carbazole, which however disappears for lab-synthesized TPA with high purity. Herein, we for the first time identify the impurity types that cause RTP of commercial TPA, which are two N, N-diphenyl-naphthylamine isomers. Due to similar molecular polarity and very trace amount (≈0.8 ‰, molar ratio), these naphthyl substituted impurities can be easily overlooked. We further show that even at an extremely low amount (1000000 : 1, mass ratio) of impurities, RTP emission is still generated, attributed to the triplet-to-triplet energy transfer mechanism. Notably, this doping strategy is also applicable to the triphenylphosphine and benzophenone host systems, of which strong RTP emission can be activated by simply doping the corresponding naphthyl substituted analogues into them. This work therefore provides a general and efficient host/guest strategy toward high performance and diverse organic RTP materials.     

Tuning the Performance of Room Temperature Phosphorescence Sensing Materials for Oxygen Using Factorial Designs

ABSTRACT

The effects of three experimental factors (pH, precursors, alcohol) on the sensing characteristics of these materials were screened by means of two-level factorial designs. The resulting materials turned out to be useful as luminescent probes for the measurement of dissolved and gaseous oxygen. The photochemical properties and the analytical performance of the RTP sensing phases have been studied by using both gas flow-injection analysis and continuous liquid flow-through systems. The proposed sensing materials were particularly suitable for measuring dissolved oxygen in natural waters. The detection limit attained was 0.004 mg.ml^?1 and a typical precision of ± 1.0% al a 0.6 mg.ml^?1 oxygen level was achieved. Response time for 90% of the final RTP value was less than 90s in a continuous flow mode. No hysteresis effects were noticed.     

Solid Surface Room Temperature Phosphorescence of Polychlorinated Dibenzofurans Enhanced by a Surface Active Agent

Abstract

Room temperature phosphorescence characteristics on filter paper of dibenzofuran (DF) and several polychlorinated dibenzofurans (PCDFs) in the presence of different heavy atoms in conjunction with a surface active agent, sodium lauryl sulfate (NaLS), have been studied. The use of this surfactant produces an enhancement of the phosphorescence intensity in all the cases studied, which improve the sensitivity in the determination of DF and PCDFs. The optimization of experimental conditions like type of filter paper, drying and cooling times of the filter paper after spotting the sample, irradiation time, concentration of heavy atom and concentration of surfactant has been carried out. Phosphorescence lifetimes, linear dynamic range, relative standard deviation and limit of detection of the different compounds were also determined.     

Supercooled Liquids with Dynamic Room Temperature Phosphorescence Using Terminal Hydroxyl Engineering

Dynamic room temperature phosphorescence (RTP) materials have potential applications in optoelectronics, which inevitably suffer from poor processability, flexibility or stretchability. Herein, we report a concise strategy to develop supercooled liquids (SCLs) with dynamic RTP behavior using terminal hydroxyl engineering. The terminal hydroxyls effectively hinder the nucleation process of molecules for the formation of stable SCLs after thermal annealing. Impressively, the SCLs show reversible RTP emission via alternant stimulation by UV light and heat. Photoactivated SCLs have phosphorescent efficiency of 8.50 % and a lifetime of 31.54 ms under ambient conditions. Regarding the dynamic RTP behavior and stretchability of SCLs, we demonstrate the applications in erasable data encryption and patterns on flexible substrates. This finding provides a design principle for obtaining SCLs with RTP and expands the potential applications of RTP materials in flexible optoelectronics.     

Ultralow-loss Optical Waveguides through Balancing Deep-Blue TADF and Orange Room Temperature Phosphorescence in Hybrid Antimony Halide Microstructures

Harnessing the potential of thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is crucial for developing light-emitting diodes (LEDs), lasers, sensors, and many others. However, effective strategies in this domain are still relatively scarce. This study presents a new approach to achieving highly efficient deep-blue TADF (with a PLQY of 25 %) and low-energy orange RTP (with a PLQY of 90 %) through the fabrication of lead-free hybrid halides. This new class of monomeric and dimeric 0D antimony halides can be facilely synthesized using a bottom-up solution process, requiring only a few seconds to minutes, which offer exceptional stability and nontoxicity. By leveraging the highly adaptable molecular arrangement and crystal packing modes, the hybrid antimony halides demonstrate the ability to self-assemble into regular 1D microrod and 2D microplate morphologies. This self-assembly is facilitated by multiple non-covalent interactions between the inorganic cores and organic shells. Notably, these microstructures exhibit outstanding polarized luminescence and function as low-dimensional optical waveguides with remarkably low optical-loss coefficients. Therefore, this work not only presents a pioneering demonstration of deep-blue TADF in hybrid antimony halides, but also introduces 1D and 2D micro/nanostructures that hold promising potential for applications in white LEDs and low-dimensional photonic systems.     

Study on the Interaction of Mitomycin C with ct-DNA by Pd-Porphin Room Temperature Phosphorescence Probe

Study of the interaction of drugs with calf thymus DNA (ct-DNA) in molecular level1-4 is helpful to understand the fundamental aspects of activation of anticancer drugs and provide the valuable information for designing and developing new antitumor agents. Mitomycin C (MMC) is an anticancer drugs being widely used in clinic with high activity and effectiveness for many cancers. DNA has been proved to be the main target molecule of MMC in the body. The activated MMC can hinder the rep…     

Use of an Imaging Spectrograph System with a Fiber Optical Sensor and Two Dimensional Cooled Ccd Detector For Solid Surface Room Temperature Phosphorescence of Pesticides

ABSTRACT

This paper presents a development of a fiber optic sensor for solid surface room temperature phosphorescence of pesticides. The system is based on an imaging spectrograph coupled with a cooled two-dimensional charge coupled device detector. An optimization approach using a different mode of reading out data, the effects of moisture in solid matrix phosphorescence and the effects of heavy atoms are discussed. Spectral characterizations on Whatman N⁰1 filter papers of Warfarin, Naptalam, and naphthalene-type pesticides were evaluated. Limits of detection at ng to pg levels were estimated for all compounds. Satisfactory reproducibility of measurements was observed. The standard addition method was used to determine concentrations of Warfarin and Naptalam pesticides present together in a mixture. Results obtained show the potential of the device for the quantitative analysis of environmental pollutants.     

A Fluorescence Probe Study on the Chiral Microenvironment of Bile Salt Organized Media

Bile salt aggregation in aqueous solution has been an active area of research, with primary emphasis on the physiological role of bile salts in lipid solubilization. More recently, bile salt media has attracted attention as an alternative to conventional micellar reagents for separations and luminescence analysis, especially for applications in chiral separations. In this study, pyrene and chiral molecular l,1'-bi-2-naphthol as fluorescence probe were used to study chiral microenvironment of bile salt organized media.     

α-环糊精修饰有机聚合物整体材料选择性富集室温磷光法测定土壤中的萘

合成了α-环糊精（α-CD）修饰的有机聚合整体材料,对合成的材料进行了表征,研究比较了α-CD修饰整体材料作为室温磷光固体基质的效果以及14种有机化合物在其上的室温磷光分析(RTP)行为。 α-CD修饰的有机聚合整体材料背景干扰低, 对二环芳烃类物质有较好的选择性和富集能力。 在α-CD修饰膜上,萘和7,8苯并喹啉的分配常数分别为5.03×103和2.94×102,表明修饰材料对萘有较好的选择性。 萘酚也能与修饰材料形成包络物。 但是由于较强的极性和在水中的溶解性,不能被有效富集。 对5.0×10-11 mol/mL萘,最大富集体积为300 mL。 采用SPE-RTP,萘和7,8苯并喹啉的检出限分别为9.80×10-12和4.60×10-11 mol/mL,RSD小于3.7%;线性范围分别为5.00×10-11~8.00×10-9 mol/mL和6.00×10-11~5.00×10-10 mol/mL。 应用修饰的膜片对土样中的萘进行选择性富集和测定,结果由GC-MS进一步确认。 用环己烷一步提取和SPE-RTP测定,萘可以被选择性富集。 在土壤样品中加萘标准0.012 8 mg,测得回收率（104.9±6.5）%。 土样中萘的浓度为（5.61±0.12） mg/kg,与GC-MS的较为吻合。