共查询到18条相似文献,搜索用时 149 毫秒
1.
菁是一种具有多功能用途的染料,除用作卤化银感光材料及有机光导材料的光谱增感剂、光记录材料中记录介质外,还可作为染料激光器中用的激光染料.我们曾合成了四甲川苯乙烯菁、五甲川(艹粦)及五甲川吡喃鎓等红外染料作为激光染料,测定了它们的光性能.本文合成了具有桥链的七甲川菁,研究了这些桥链七甲川菁的吸收光谱及荧光光谱,并以YAG激光倍频(532nm)作泵浦源,测定了它们的激光调谐范围、中心波长及激光转换效率. 相似文献
2.
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
3.
含喹啉环端基不对称三甲川菁的合成与性能 总被引:1,自引:0,他引:1
含喹啉环端基不对称三甲川菁的合成与性能姚祖光,陈峡华,张清华(华东理工大学精细化工研究所,上海,200237)关键词菁,电子吸收光谱,光稳定性,光谱增感菁染料是一种卤化银乳剂的有效光谱增感剂[1],近年来随着光源的变化,特别是半导体激光器的研制成功,... 相似文献
4.
5.
6.
7.
8.
9.
合成了八个新的含吡喃翁端基的不对称三甲川染料,通过元素分析,IR光谱及1H-NMR谱确证了这些化合物的结构。最大吸收波长在630-680nm,有大的半峰宽。 相似文献
10.
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
11.
LiQiuWANG XiaoJunPENG ErHuLU JingNanCUI XinQinGAO 《中国化学快报》2005,16(4):461-464
Novel heptamethine 3H-indocyanine dyes are synthesized and embedded into a matrix of silica gel derived from tetraethoxysilicane. The photophysical properties of these near infrared dyes in various solvents and in SiO2 sol gel were investigated. The results show that the dyes containing cyclohexenylene bridge and N-(p-carboxy)benzyl groups have better photostability and longer absorption wavelength than those containing linear heptamethine bridge and/or N-(5-carboxy)pentanyl groups. The absorption maxima of these dyes are in reverse proportion to the polarity of the solvents. The microenvironment of the dyes in SiO2 sol-gel characters medium polarity (between methanol and DMF) according to the absorption maxima. 相似文献
12.
Xiu‐Fu Zhang Jun‐Long Zhao Wei‐Bin Bi Dan‐Dan Zhang Zhi‐Yuan Yang Lan‐Ying Wang 《中国化学会会志》2013,60(5):503-510
One benzoindole pentamethine cyanine dye was synthesized and characterized by 1H NMR, IR, MS and UV‐Vis spectra. The UV‐Vis absorption and fluorescence spectra of the dye in chloroform, dimethyl sulfoxide, acetone, ethanol and methanol were investigated, and the λmax of the dye was in the region 682.0–689.0 nm with large molar extinction coefficients (? > 105 M?1cm?1) in different solvents. The structure of the dye was also characterized and analyzed by X‐ray diffraction. Crystallographic data revealed that the dye belonged to orthorhombic, with space group P212121, a = 10.059(2) Å, b = 15.098(4) Å, c = 24.989(6) Å, V = 3794.8(15) Å3, Z = 4. The C‐H···F intermolecular hydrogen bonds were displayed in the molecular system, which were effective in the molecular packing. The aggregation behavior and thermodynamic properties of the dye in aqueous methanol solution were also studied by means of UV‐Vis spectroscopy methods. The results indicated that the dye existed monomer‐dimer equilibrium in aqueous methanol solutions. The fundamental properties of the dye, such as the dimeric association constant KD, the dimeric free energy ΔGD, the dimeric entropy ΔSD, and the dimeric enthalpy ΔHD were determined. The ΔHD of the dye was –46.0 kJ mol?1. 相似文献
13.
14.
Syed Muhammad Usama Tye Thompson Kevin Burgess 《Angewandte Chemie (International ed. in English)》2019,58(27):8974-8976
Polymethine bridges in cyanine dyes may be constrained by setting them into edge‐fused ring systems, or extended by conjugation with carefully chosen heterocycles. Recent studies have shown that modifications like these can give significantly brighter dyes with red‐shifted absorbance and emission maxima. 相似文献
15.
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
16.
氯取代硫三碳菁染料的合成及性能 总被引:2,自引:1,他引:2
本文合成了七个硫三碳菁.其中四个具有桥环的菁染料。测定了它们的电子吸收光谱,讨论了结构对光稳定性的影响。并发现镍络合物能有效地抑制菁染料的光退色。 相似文献
17.
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
18.
Chi Min DU Ju Hua XU Yu Liang LI* Zhi Qiang SHI Shu WANG Dao Ben ZHU Center of Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 《中国化学快报》2001,(8)
Fullerene derivatives containing two or more [60]fullerene units may exhibit interesting properties1. There have been reported a limited number of organofullerenes with two or more cages, and the synthetic procedures are an oxidative coupling reaction of terminal alkynes2, bifunctional cycloaddition reactions such as diazo compounds3, dienes4 or (-amino acids and aldehydes 1, 3-dipolar cycloaddtion5, cyanogen di-N-oxide as a double 1, 3-dipole6. Oxo- and methylene-bridged [60]fullerene dimers … 相似文献