共查询到18条相似文献,搜索用时 93 毫秒
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合成并表征了系列水溶性五甲川菁染料, 研究了其在不同溶剂中的光谱性能. 结果表明, 染料在水中的最大吸收和荧光光谱在647~665 nm波长范围内, 荧光量子产率达到0.1左右. 考察了N位取代基对染料水溶液光稳定性的影响, 结果表明, 在N原子上引入带有苯环结构和大体积的磺酸基, 可以提高染料的光稳定性. 高效液相色谱(HPLC)分析结果表明, 染料4a的N-羟基琥珀酰亚胺(NHS)活性酯标记牛血清白蛋白(BSA)的检测限为1.2×10-8 mol/L, 与紫外检测相比, 检测灵敏度提高了近2个数量级. 相似文献
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合成并表征了5种不对称五甲川菁染料,染料在甲醇中的最大吸收和荧光光谱在646—666nm之间.光降解实验证明两端取代基结构呈不对称的染料,其光稳定性明显高于两端取代基结构对称的染料.染料荧光光谱和pH值的关系表明,染料中引入苯环取代基可以增强染料在酸性或碱性溶液中的稳定性. 相似文献
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以磺酸基苯肼和7-甲基-8-氧代壬酸为原料合成了2,3-二甲基-3-羧戊基-3H-吲哚-5-磺酸;以2,3,3-三甲基-3H-吲哚-5-磺酸和1,3-丙磺酸内酯为原料合成了1-磺酸丙基-2,3,3-三甲基-3H-吲哚-5-磺酸;然后通过半菁合成法合成了一种新型水溶性不对称五甲川吲哚菁染料(Cy5)。产物经C18反相硅胶柱分离,收率57%,其结构经1H NMR、HRMS进行确证。并检测了目标化合物的光谱性质,初步探讨了其在生物标记方面的应用。染料具有良好的水溶性和光稳定性,水溶液的最大紫外吸收波长和最大荧光发射波长分别为646和666 nm,荧光量子产率为0.2,用n(活化菁染料)∶n(牛血清蛋白)=2∶1标记蛋白,D/P值为1.56。 相似文献
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N—苄基吲哚三碳菁染料的合成及性能 总被引:2,自引:0,他引:2
合成了5种N-苄基吲哚三碳菁染料,通过红外光谱、核磁共振氢谱及元素分析确证了其结构,并研究了电子吸收光谱、荧光光谱、光稳定性及溶解度。结果表明,染料溶液和膜的最大吸收波长均为780 ̄830nm;染料在二氯乙烷中的溶解度大于在乙醇中的溶解度;氮原子上苄基的吲入极大地改变了染料的光稳定性(与HITCI比较)。 相似文献
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N-苄基吲哚三碳菁染料的合成及性能 总被引:1,自引:0,他引:1
合成了5种N-苄基吲哚三碳菁染料,通过红外光谱、核磁共振氢谱及元素分析确证了其结构,并研究了电子吸收光谱、荧光光谱、光稳定性及溶解度。结果表明,染料溶液和膜的最大吸收波长均为780~830nm;染料在二氯乙烷中的溶解度大于在乙醇中的溶解度;氮原子上苄基的引入极大地改进了染料的光稳定性(与HITCI比较). 相似文献
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吲哚二碳菁染料的合成 总被引:2,自引:0,他引:2
合成了五种N-烷基吲哚二碳菁染料,通过质谱、核磁共振氢谱及红外光谱确证了化合物结构。测定了化合物在溶液中的紫外吸收光谱和溶解度,讨论了溶解度、熔点与染料分子结构的关系。 相似文献
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采用新染料五甲川菁(Penta Methyl Cyanine)敏化TiO2纳米结构电极,UV-Vis吸收光谱和光电化学结果表明,使用该染料敏化使TiO2纳米结构电极吸收波长红移至可见光区和近红外区,可显著地提高TiO2纳米结构电极在可见光区的阳极光电流强度,明显改善光电转换效率。结合吸收光谱、电化学和光电化学结果初步讨论了敏化电极的光生电流的机理。 相似文献
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Two novel water‐soluble indocyanine dyes were synthesized. Their chemical structures were confirmed by 1H NMR, IR, MS and UV‐vis techniques. The absorptions of the prepared dyes in different solvents were measured. Two dyes exhibited negative solvatochromism, with a blue shift of the absorption and an emission maximum in (bovine serum albumin) protonic solvent relative to non protonic solvent. The fluorescence properties of the dyes in both free state and BSA were investigated. Significant enhancement of the fluorescence intensity for the Dye2 was observed in the presence of BSA. Dye2 could be proposed as fluorescent dyes for BSA detection in aqueous solution. 相似文献
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通过向吲哚环“N”位上引入一个含聚乙二醇(PEG)醚链的非离子亲水基团,合成了一种新型水溶性不对称五甲川吲哚菁染料。 用核磁(1H NMR)和高分辨质谱(HRMS)表征染料的结构,测试了染料的光谱性能,标记牛血清白蛋白(BSA),并对固定细胞和活细胞分别染色。 结果表明,该染料在水中的最大紫外吸收波长和荧光发射波长分别为648和668 nm,斯托克斯(stokes)位移为20 nm,荧光量子产率(Ф)为0.13,以碘钨灯为光源光照8 h后,染料光降解率为5.8%。 用染料的NHS活性酯标记牛血清白蛋白,标示率(D/P)为1.16。 对固定细胞染色发现,染料可对细胞整体着色,对细胞核染色最明显,能清晰看到核仁。 对活细胞染色发现,有少量染料跨膜进入细胞内部,对细胞质和细胞核有微弱染色,但在活细胞膜上聚集明显。 相似文献
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aza-BODIPY荧光染料是近10年发展起来并受到广泛关注的一类新型荧光化合物,它极有可能发展成可应用于光动力学治疗的光敏剂.本工作合成了5个aza-BODIPY 1a~1e,用IR,NMR,MS和元素分析对它们进行了表征.研究了它们的紫外吸收光谱与荧光发射光谱,结果表明1a~1e具有较高的摩尔吸光系数,在aza-BODIPY母环的3,5位或1,7位的苯环4位有供电子取代基时能使化合物的最大紫外吸收波长和荧光发射波长红移.测试了1a~1d的循环伏安曲线,根据各化合物的氧化还原电位讨论了它们的结构稳定性. 相似文献
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合成了系列杂环氮原子具有不同取代基的不对称苯并噻唑三次甲基菁染料,染料结构经过质谱、1H NMR表征.测试了染料在乙醇中的吸收和荧光发射光谱,染料的最大吸收值和荧光发射值分别在628~631和662~666 nm之间.染料在溶剂中几乎无荧光,可以极大的降低染料自身的荧光背景干扰.染料的光降解实验表明:喹啉环上辛烷基取代和噻唑环上苄基取代时,染料的光稳定性最强.染料8a~8d的光降解速率常数分别为6.38×10-4,12.5×10-4,2.68×10-4和6.30×10-4mol min-1.循环伏安实验法测试了染料的氧化电位. 相似文献
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Staining microplastics (MPs) for fluorescence detection has been widely applied in MP analyses. However, there is a lack of standardized staining procedures and conditions, with different researchers using different dye concentrations, solvents, incubation times, and staining temperatures. Moreover, with the limited types and morphologies of commercially available MPs, a simple and optimized approach to making fluorescent MPs is needed. In this study, 4 different textile dyes, along with Nile red dye for comparison, are used to stain 17 different polymers under various conditions to optimize the staining procedure. The MPs included both virgin and naturally weathered polymers with different sizes and shapes (e.g., fragments, fibers, foams, pellets, beads). We show that the strongest fluorescence intensity occurred with aqueous staining at 70 °C for 3 h with a dye concentration of 5 mg/mL, 55 mg/mL, and 2 µg/mL for iDye dyes, Rit dyes, and Nile red, respectively. Red fluorescent signals are stronger and thus preferred over green ones. The staining procedure did not significantly alter the surface, mass, and chemical characteristics of the particles, based on FTIR and stereomicroscopy. Stained MPs were spiked into freshwater, saltwater, a sediment slurry, and wastewater-activated sludge; even after several days, the recovered particles are still strongly fluoresced. The approach described herein for producing customized fluorescent MPs and quantifying MPs in laboratory-controlled experiments is both straightforward and simple. 相似文献
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Novel furo, thieno and pyrrolo[2,3‐b]pyrazole cyanine dyes were synthesized. The structure‐photosensitization properties correlation of the dyes were examined in 95% ethanol solution by absorption spectroscopy. The chemical structure of the starting biheterocyclic compounds and their derived cyanine dyes were confirmed by elemental analysis, IR and 1H NMR spectroscopy. 相似文献
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Here, the synthesis of two novel series of dichromophoric cyanine dyes were reported. The first series of novel bis-azacyanine dyes 3a–d was afforded by reaction of 2-(1,3,3-trimethyle indoline-2-ylidene)acetaldehyde with diaminoaromatics, and the second series of novel bis-diazacyanine dyes 4a–d was obtained using quaternization of an amine group in disazo compounds, which were produced by the reaction of disazoaromatics with 2-methylene-1,3,3-trimethyle indoline. The products were identified by 1H NMR, 13C NMR, infrared, UV-vis, and mass spectroscopy. 相似文献