一种近红外花菁染料的合成及其应用于生物大分子的测定

光谱性质;蛋白质;核酸测定;一种近红外花菁染料的合成及其应用于生物大分子的测定     

多孔柿饼状BiOBr光催化剂的简易溶剂热法合成（英文）

以硝酸铋和十六烷基三甲基溴化铵(CTAB)为Bi和Br源,采用聚乙烯吡咯烷酮(PVP)辅助溶剂热法首次成功制备了多孔纳米片聚结的柿饼状溴氧化铋(BiOBr)。通过多种分析技术对分级微米结构BiOBr材料的物化性质进行了表征,并对其在可见光照射下降解亚甲基蓝(MB)的光催化活性进行了评价。结果表明,溶剂热时间和PVP的加入量对产物的颗粒形貌和结晶度有显著影响。当加入0.7 g PVP时,120℃溶剂热处理12 h,可得到多孔纳米片聚结的柿饼状BiOBr样品。多孔柿饼状BiOBr样品的比表面积为4 m2·g^-1,带隙能为2.64 eV,在可见光区具有较强的光吸收性能,具有良好的可见光驱动降解MB的光催化活性和稳定性。我们推断,多孔纳米片聚结的柿饼状BiOBr样品具有优良的可见光催化性能,这与该样品的较高比表面积、多孔结构、低带隙能以及独特的颗粒形貌有关。     

Multi‐responses Methodology Applied in the Electroanalytical Determination of Hair Dye by Using Printed Carbon Electrode Modified with Graphene

This paper describes a rapid and sensitive method for determination of the hair dye Basic Blue 41 in wastewater samples using screen‐printed carbon electrodes modified with graphene (SPCE/Gr). The method is based on the reversible reduction of azo groups of the dye at potential of ?0.23 V/?0.26 V, where both the anodic and cathodic currents increased 1,300 % when compared to screen‐printed carbon (SPCE) and glassy carbon electrodes (GCE). The optimization of a square wave voltammetric method was performed by means of 2³ factorial design, Doehlert matrix and multi‐response assays, and the best parameters were: frequency (54.8 Hz), step potential (6 mV), pulse amplitude (43.7 mV) and pH 4.5. The analytical curve was constructed from 3.00×10^?8 to 2.01×10^?6 mol L^?1, with detection and quantification limits of 5.00×10^?9 and 1.70×10^?8 mol L^?1, respectively. The repeatability of the method evaluated for 10 consecutive measurements at concentrations of 1.70×10^?7 mol L^?1 and 1.70×10^?6 mol L^?1, showed relative standard deviation of 3.56 and 0.57 %, respectively. The sensor based in SPCE/Gr was successfully applied in wastewater samples collected from a drinking water treatment plant and validated by comparison with HPLC‐DAD method with good accuracy.     

一种基于丹磺酰胺染料的高选择性汞(Ⅱ)离子荧光探针

对人类健康和社会环境而言,汞离子被认为是毒性最大的金属离子之一.本文设计、合成了一种新型基于丹磺酰胺染料的荧光探针,并研究了其对金属阳离子的识别性质.研究结果表明:该荧光探针在水溶液中,对汞离子具有高度的选择性和良好的灵敏度,且不受其它金属阳离子的干扰.该探针对汞离子的检测限可以达到2.1×10-8 mol/L.该探针极低的检测限和良好的水溶性表明其可用于活细胞中检测汞离子.生物成像实验证实该探针具有良好的细胞膜透性和生物相容性.     

方酸菁荧光探针的应用研究进展

功能性方酸菁染料具有独特的D-A-D共轭结构,其在可见光和近红外区域有强烈的吸收和荧光发射。方酸菁染料作为近红外荧光探针母体被应用于蛋白质、氨基酸、一些生物小分子、环境污染物及金属离子等的检测。本文结合课题组近几年工作综述了方酸菁染料在蛋白质、氨基酸、生物小分子、阳离子和其它物质检测方面的应用。     

一种新型磺酸修饰的共价有机框架用于二氧化碳吸收和染料吸附

环境污染是地球现今的重要问题之一,而其中就包括水污染与温室效应.共价有机框架(covalent organic frame-works,COFs)作为一种新兴的晶态多孔聚合物,因其优异的吸附性能,在污染治理领域具有广阔的应用前景.本工作报道了一种基于β-酮胺单体通过迈克尔加成-消除反应合成的磺酸型微孔COF (JUC-...     

Porous multicomponent chitosan/poly(ε-caprolactone)-block poly (ethylene glycol)/SiO2 aerogel@polydopamine membrane for Congo red adsorption

A composite adsorbent, chitosan//poly (ε-caprolactone)-block poly (ethylene glycol)/SiO₂ aerogel@polydopamine (CS/PCL-b-PEG/SA@PDA) membrane was prepared for the adsorption of organic dyes. The matrix polymer materials of this novel adsorbent were eco-friendly. SiO₂ aerogel with nanoporous network construction was fixed in the multicomponent polymer fibers through simultaneous electrospinning-electrospray technology followed by modification of polydopamine (PDA). The composite adsorbent had a maximum adsorption capacity of 598.8 mg/g for Congo red (CR) and possessed good reusability performance. This adsorbent showed excellent performance for the selective adsorption of relatively large molecule CR dyes even under high concentration of small molecule methyl orange (MO) dyes or 1 M of salt solution. The adsorption mechanism indicated that the –NH₂ and –OH groups in adsorbent could generate the stronger electrostatic attraction with the –SO₃^- groups in CR. Meanwhile, the sufficient adsorption spaces of the adsorbent were constructed by the porous network structure of SiO₂ aerogel, the accumulation of PDA particles and the porous structure of the multicomponent composite membrane. The work provided a proactive study in designing an adsorbent for the selective adsorption of organic dyes.     

一系列基于混合配体策略构筑的金属有机骨架的合成、结构及性质

通过简单高效的醛酮缩合反应,合成了碱性配体2,6-二（4-吡啶基亚甲基）环己酮（BPCH）,采用3种芳香羧酸配体：对苯二甲酸（H₂TP）、间苯二甲酸（H₂IP）和均苯三甲酸（H₃TMA）,以混合配体策略制备了7例金属有机骨架（MOFs）。用单晶X射线衍射、红外光谱、粉末X射线衍射和热重分析对其进行表征并分析其拓扑结构。MOFs1、2、3均呈现为多样的三维结构,MOFs4~7表现为同构的二维结构。荧光测试结果显示该类化合物对Fe³⁺有较好的荧光猝灭效应,同时对于染料具有一定的吸附能力。     

A BODIPY-based highly emissive dye with thiophene-based branch harvesting the light

ABSTRACT

A novel BODIPY-based dye with highly emissive character was configured by Sonogashira coupling and routinely characterized by NMR and MS technology. The emission of dye was investigated in solution/film/solid and shows intensive emission. In solution, the emission peak appeared around 510 nm with little influence by the polar environment. The terthiophene plays an effective antenna effect, harvesting the light and transferring the energy to BODIPY. The pseudo Stoke's shift enlarged to ～170 nm in solution. In film, the emission peak shifted to 563 nm in polycarbonate matrix. And it shifted further to 585 nm in solid due to the highly twisted structure, which avoided closely regular-tight packing. The dye rendered an intense fluorescence, good optothermal stability, and high fluorescence quantum yield (0.55). The solid emission showed highly red emission with Commission Internationale de L'Eclairage (CIE) coordinates of (X = 0.69, Y = 0.31). Thus, the synthesized dye is idea candidate for emitting materials.     

混合染料荧光选择性增强受激拉曼散射Stokes波

报道用不同混合比的罗丹明6G(R6G)和罗丹明B(RB)混合染料荧光选择性放大CCl₄和苯的受激拉曼散射不同阶次Stokes波。CCl₄二至五阶Stokes波分别被混合摩尔比为20∶2,20∶13及20∶40(R6g∶RB)的R6G和RB的混合染料荧光放大;一阶Stokes波强度被混合溶液削弱。这是由于到二至五阶Stokes波分别位于以上三种混合溶液荧光峰附近,并且都远离了R6G和RB的吸收峰,混合溶液的荧光增强作用大于吸收作用,因此这几阶Stokes被混合溶液荧光放大。而CCl₄的一阶Stokes位于RB吸收峰附近,又远离各混合溶液荧光峰,溶液的吸收作用大于荧光增强作用,导致一阶Stokes被混合溶液削弱。文章还报道了苯的一、二和三阶Stokes波分别被不同混合比的R6G和DCM的混合乙醇溶液放大,并预测了该方法应用前景。