共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
具有桥链七甲川菁染料的合成及其电子吸收光谱 总被引:1,自引:0,他引:1
合成了三个具有桥链的七甲川菁染料。研究染料结构对最大吸收波长的影响,并测定了染料在18种溶剂中的吸收光谱,发现染料的vmax^ab分别与溶剂的n^2-1/2n^2 1,(ε-n^2)(2ε n^2)/ε(n 2)^2和ε-1/ε 2-N^2-1/n^2 2存在着良好的线性关系。 相似文献
3.
近红外吲哚碳菁染料及应用 总被引:2,自引:0,他引:2
近红外甲川链吲哚碳菁染料以其特有的结构,而具有多种功能和用途,已成为在光盘、太阳能电池、照相感光、生物分析等方面应用最为的染料品种之一。探讨了2,3,3-三甲基-3H-吲哚甲川链类菁染料的结构、合成及性能等,综述了其在上述领域中取得的重大应用进展,提出了其中所存在的问题。 相似文献
4.
5.
菁染料薄膜的光谱性能及稳定性的研究 总被引:2,自引:2,他引:2
本文研究了6种长链菁染料薄膜的光谱特性与光稳定性,以及两种抗氧剂对其薄膜光稳定性的影响,研究表明,结构相近的菁染料利用旋涂法成膜后,光稳定性与其母核的结构有关,依吲哚〉喹啉〉恶唑〉塞唑〉硒唑而变,与溶液状态相类似,两种抗氧剂均为有效的单重态氧猝灭剂,都能提高菁染料的光稳定性。 相似文献
6.
7.
8.
方酸菁类功能染料及其应用 总被引:2,自引:0,他引:2
方酸与供电子基团,如芳胺、酚含氮杂环化合物等发生缩合反应,可生成一系列吸收波长在近红外区的方酸菁染料。这类染料具有特殊的光学性能。良好的光、热稳定性。因此,被作为功能广泛应用,本文对这类化合物的合成方法,结构及光谱性能,应用等方面进行了综述。 相似文献
9.
设计、合成了3种水溶性吲哚菁染料(发射波长:690 nm),用核磁共振(NMR)对其进行了表征,测试了菁染料在不同溶剂中的紫外吸收光谱和荧光发射光谱;为了探讨菁染料在生物分析领域的应用性,测定3种菁染料在十六烷基三甲基溴化铵(CTAB)和十二烷基磺酸钠(SDS)两种表面活性剂胶束模拟的生理条件下的吸收和发射光谱,利用循环伏安法(CV)测定了菁染料的光稳定性,在近红外区域观察了染料对肾癌细胞的活细胞染色性能,并计算了3种菁染料的摩尔吸光系数和荧光量子产率。 相似文献
10.
11.
菁染料和份菁染料溶液的光降解机理的研究 总被引:1,自引:0,他引:1
利用UV-Vis吸收光谱仪和光化学反应器,研究了菁染料和份菁染料溶液的光降解动力学,认为染料在乙腈溶液中的光褪色反应服从假一级或零级动力学,利用GC/MS光谱仪检测了染料的光降解产物,与相应的份菁染料相比,携带正电荷的菁染料具有相对较好的光稳定性,研究结果表明,菁染料光降解反应的中间体可能是染料的半氧化态Dye^ ,并利用纳秒级闪光光解技术研究了Dye^ 的瞬态吸收光谱。 相似文献
12.
A number of new styryl, aza-styryl, acyclic mero, cyclic mero and mixed cyanine dyes with a benzo[2,3- e ; 2',3'- e ']bis-1,3,4-oxadiazine nucleus were synthesised. The absorption spectra in the visible region of all the synthesised cyanine dyes in 95% ethanol solution were examined and studied in detail. Anti-bacterial activity for a number of selected dyes was evaluated against various bacterial strains. The structural determination was carried out using elemental and spectroscopic analysis. 相似文献
13.
《Dyes and Pigments》2006,68(1):11-18
New cyanine dyes including monomethine cyanine dyes (simple cyanine dyes) and trimethine cyanine dyes (carbocyanine dyes) incorporating benzo[2,3-b; 2′,3′-b′]bispyrazolo[4,5-b]-1,4-(oxa-, thia-, and pyra)-zine-6,12-dione were prepared. Structure-spectra studies were carried out via measuring the electronic visible absorption spectra of these dyes in 95% ethanol. Structural confirmations were determined through elemental analysis, IR, 1H NMR spectroscopy and MS spectral data at the Micro Analytical Center, Cairo University. 相似文献
14.
Robert Gray David Walton John Bickerton Paul Richards John Heptinstall 《Dyes and Pigments》1996,30(4):321-332
From investigations into the absorption and fluorescence characteristics of several new meso-amine substituted heptamethine cyanine dyes and the commercially available laser dyes IR140, IR132 and IR144, it appears that these dyes exist in at least two interconvertible ground state isomeric conformations in organic solvents. From the position and nature of absorption and fluorescence characteristics, it is concluded that these conformers differ in the contribution to the chromophore of the meso-amine substituent, which either acts as an electron-donor by resonance or else withdraws by induction. Fluorescence emission below 900 nm can only be attributed to the conformer in which the meso-amine groups acts as an electron-donor by resonance. This gives rise to a system that is analogous to the allopolar isomerism exhibited by holomeropolar cyanine dyes. 相似文献
15.
Alkane α,γ-bis[4-methylpyridinium] diiodide and alkane α,γ-bis[4-methylquinolinium] diiodide were prepared and used as starting materials in the synthesis of dichromophoric cyanine dyes. Structural confirmation of the synthesized dyes was carried out by 1H NMR, MS spectroscopy and elemental analysis. The electronic absorption and the emission spectra for all the hemicyanines were measured in four organic solvents of varying polarity. All derivatives absorb in the region of about 500 nm and have molar absorptivity of about 104 M−1 cm−1. The absorption spectra of tested compounds are affected by their structure i.e. the structure of dialkyl(aryl)amino group, the electron acceptor part of the dye and the linker between two identical hemicyanine chromophores. The fluorescence bands' positions, in contrast to the absorption, are strongly affected by the solvent polarity. 相似文献
16.
17.
18.
用水煮法提取了天然茶叶染料,研究了茶叶色素的吸收光谱。对固液比、提取温度、浸提剂酸度、反应时间等提取条件进行了研究,并测定了色素在不同pH、温度等条件下的稳定性。结果表明,提取茶叶色素的最佳工艺条件为固液比1∶20,在沸煮(100℃)的条件下提取50分钟。该色素受pH影响较明显,对氧化剂、还原剂较敏感,但耐热稳定性较好。金属离子Ca2+、Cu2+、Zn2+、Mg2+、Na+、K+、Pb2+、Sn2+、Ni2+的存在对色素色泽基本无影响,Al3+、Fe2+、Fe3+的存在对色素有不良影响。茶叶色素易溶于水、乙醇、低浓度乙酸等极性溶液,不溶于苯、丙酮、氯仿、乙醚等非极性溶剂,属水溶性色素。 相似文献
19.
H A Shindy 《Coloration Technology》2007,123(5):298-305
Novel heterocyclic monomethine, bis monomethine, trimethine and bis trimethine cyanine dyes incorporating benzo [2,3-b; , - ] bis furo [3,2-d] pyrazole nuclei were synthesised. The absorption characteristics of the prepared cyanines were studied and determined through measuring their electronic visible absorption spectra in 95% ethanol. The solvatochromism of some of the synthesised dyes was investigated. 相似文献
20.
报道了具有相同发色团,并有不同电荷的二种菁染料单分子膜中J-聚集体的形成。测定了单分子膜的π/A,△V/A曲线,反射光谱及吸收光谱。从实验结果得出:带正电荷的染料与花生酸混合形成单分子膜后,膜中染料的二聚体与J-聚集体随着表面压力改变存在着一个平衡。而带负电荷的染料与二十烷基胺成膜后,即使在很低的表面压下也有J-聚集体形成。同时染料分子在水面上的取向是各向异性。 相似文献