溴代呋喃杂环取代BODIPY染料的合成及光谱性能研究

通过吡咯和2-呋喃甲醛经一步法合成了新型含呋喃环的BODIPY荧光染料,并进一步溴化合成了一溴和二溴五元杂环类BODIPY染科,所有合成的染料分子均通过质谱、核磁等手段进行了结构表征.并测试了这些荧光染料的吸收光谱和发射光谱,研究了不同极性的溶剂对染料光谱性能的溶剂化效应以及Br原子对染料光谱的重原子效应.结果表明:随...     

五元杂环取代BODIPY染料的合成及光谱性能研究

以吡咯和2-呋喃甲醛、2-噻吩甲醛为原料,经缩合、氧化、环化反应合成了含新型五元杂环的BODIPY荧光染料,进一步溴化分别得到两种一溴代染料,所有合成的染料分子均通过质谱、核磁等手段进行了结构表征,并测试了这些染料的吸收光谱和发射光谱.结果表明:所有染料随着溶剂极性的增大表现出一定的溶剂化效应,吸收和发射波长变化不大(...     

1,8-萘酰亚胺类化合物的荧光光谱性能研究

研究了11种新型1，8-萘二甲酰亚胺类荧光化合物的荧光光谱性能。利用紫外光谱仪和荧光光谱仪测定了这两类化合物的紫外光谱和荧光光谱，分别得到最大吸收波长、最大激发波长、最大荧光发射波长，并以硫酸奎宁的0.5mol／l硫酸水溶液为参比标准，测定了各化合物的荧光量子产率在此基础上，研究了浓度、溶荆对荧光性能的影响、以及化合物结构与荧光性能的关系。结果表明，1，8-萘酰亚胺粪化合物随着浓度的增大，荧光光谱发生红移，且斯托克斯位移增大。随着溶剂极性的增大，最大荧光发射波长发生红移，斯托克斯位移增大，荧光量子产率增大在1，8-萘酰亚胺类化合物的4-位引入笨并呋喃取代基后，最大荧光发射波长红移70nm～100nm，斯托克斯位移增大20nm～50nm，荧光量子产率明显增大。     

由4-氨基二苯醚合成三苯二噁嗪荧光染料

以4-氨基二苯醚为原料合成了10个新结构三苯二口恶嗪型荧光染料,测定了它们在甲苯、氯仿、DMF、丙酮和乙醇中的吸收光谱和荧光光谱。结果表明,这些染料发色强度大(εm ax>7×104),荧光强度高(在甲苯中Ф=0.43~0.78),染料的摩尔消光系数、荧光量子产率和Stokes位移与溶剂极性参数ET之间呈线性变化关系。     

[α-n-C5H11O]4PcPd染料的溴化对性能的影响

合成了一种新的α位四戊氧基取代的钯酞菁,以其为原料作了不同程度的溴化反应并得到了一系列的酞菁染料溴化物.实验证明,溴化后的酞菁染料最大吸收波长红移,摩尔消光系数降低,热稳定性也有所降低,热失重曲线发生了很大变化.     

四碳连接臂水溶性吲哚方酸双菁染料的合成及性能

以苯肼和对肼基苯磺酸为原料合成了一种水溶性对称吲哚方酸双菁染料。最终染料用C-18反相柱进行分离提纯,通过核磁共振氢谱对染料结构进行了表征,测试其在不同溶剂中的紫外-可见吸收和荧光发射光谱。结果发现所合成双菁染料的吸收和发射光谱范围以及Stokes位移、摩尔消光系数与单菁染料相比没有大的变化,荧光量子产率小于单菁染料。     

基于氟硼二吡咯亚甲基荧光探针的研究进展

氟硼二吡咯亚甲基(BODIPY)荧光染料具有易于修饰、高摩尔消光系数、高荧光量子产率、优异的光稳定性、对溶剂的极性和pH敏感性低等许多突出特性,被广泛用于有机小分子荧光探针的构建.综述了2019年以来BODIPY荧光探针在金属阳离子、阴离子、活性氧和生物硫醇等检测方面的研究进展,梳理了这些探针的设计思路,对比了它们的检...     

新型二苯乙烯类固体荧光染料的合成及性能研究

本文合成了一种以二苯乙烯为骨架的固体荧光染料,并对其进行了基础的光物理性质研究。实验结果显示,在DMSO溶液中,该染料的最大紫外吸收峰为395 nm,最大荧光发射峰为560 nm;固体最大荧光发射峰为547 nm,荧光为黄绿色;该染料具有明显的溶致变色效应,随着溶剂极性的增大,溶液的最大发射波长出现显著红移,呈现了从蓝色到黄色的大跨度变色。     

三苯胺多枝化合物光谱性能的研究

研究了含三苯胺多枝化合物———4 正丁氧基苯乙烯三苯胺(T1)、双(4 正丁氧基苯乙烯)三苯胺(T2)和三(4 正丁氧基苯乙烯)三苯胺(T3)溶液的光谱行为.结果发现:在三苯胺对位进行单枝化(T1)、双枝化(T2)和三枝化(T3)后,摩尔吸光系数增大且最大吸收波长红移,但红移幅度依次减小,表明经多枝化处理后分子能带带隙趋于接近.在不同的溶剂中,T1—T3荧光行为有所不同:在环己烷中相对荧光强度的顺序为T3>T2>T1;随着溶剂极性增大,荧光强度顺序发生反转,为T1>T2>T3.量子产率数值(Φf)表明,随着溶剂的极性增大,T1和T2、T3的量子产率变化顺序也不同:T1的Φf值随溶剂极性的增大而增大,而T3的Φf值则基本是随着溶剂极性的增大而依次减小.造成这种差别的原因可能是ICT和TICT两发光态在极性不同的溶剂中相互转化、平衡移动所致.     

可溶性镍酞菁的光谱特性研究

利用UV－Vis吸收光谱、荧光光谱及半经验ZINDO／S方法，研究了4种可溶性镍酞菁（FPcNi,MePcNi,iBPcNi,iPPcNi)的电子吸收光谱和荧光光谱。研究结果表明：随着取代基的供电子能力增加，酞菁的最大吸收波长（λmax)和发射波长（λem）发生红移，摩尔消光系数变小；随着溶液浓度增大，酞菁聚集体浓度增大，λmax发生蓝移，但浓度对λem影响较小，同时荧光相对强度随浓度增大，出现最大值；随着溶剂配合能力的增加，λmax，λem都发生红移。     

Synthesis and properties of some novel pyrazolone-based heterocyclic azo disperse dyes containing a fluorosulfonyl group

A series of heteroarylazo disperse dyes derived from pyrazolones and fluorosulfonyl anilines were synthesized, and their thermal and spectral properties were investigated with respect to the effect of substituents on absorption spectra, halochromism, and solvatochromism. Heteroarylazo disperse dyes, which contain a nitro group instead of a fluorosulfonyl group para to the azo group in the diazo component, were also synthesized for comparative purpose. The fluorosulfonylarylazopyrazolone dyes had absorption maxima at shorter wavelength and showed lower extinction coefficients than the nitroarylazopyrazolone dyes. The synthesized dyes also exhibited positive halochromism and solvatochromism, so the absorption bands of the dyes moved toward longer wavelengths as the acidity or polarity of the solvent increased. 4-Fluorosulfonyl-substituted dyes generally showed lower thermal stability than their 4-nitro-substituted analogs, because the lower electron-withdrawing power in the diazo components tended to decrease the polarizability and dipole interactions.     

4′-二甲氨基查尔酮衍生物的发光性能研究

研究了溶剂极性对4′-二甲氨基查尔酮衍生物的紫外-可见光吸收及荧光性能的影响。结果表明,随着溶剂极性的增加,其紫外-可见光最大吸收波长红移,荧光发射波长也红移,荧光发射强度先下降后升高再下降,具有溶剂极性敏感的荧光特性,可用作荧光探针。     

Excitation Dependent Fluorescence Quantum Yield in Hydrocarbon Fuels Containing Polycyclic Aromatic Compounds

Fluorescence emission spectra and quantum yields have been measured for neat sample of six different hydrocarbon fuels over different possible excitation wavelengths. Hydrocarbon fuels show different excitation fluorescence cutoff depending on their commercial use and applications in the UV ～ visible region. The fluorescence emission maximum of these fuels shows a red shift with excitation wavelength. Resonance energy transfer and self-quenching through solvent collision of fluorophores play an important role on the fluorescence characteristics of multifluorophoric mixture like petroleum fuels at higher concentration. The fluorescence quantum yield of these fuels is a function of the excitation wavelength and is different for different fuels. The change in quantum yield with excitation wavelength for petroleum fuels is different from that of crude oils. The change in fluorescence quantum yield at lower excitation wavelength provides a promising tool to estimate contamination of diesel and petrol by kerosene.     

Novel azobenzothiazole dyes from 2-nitrosobenzothiazoles

Novel azobenzothiazole dyes obtained by condensation of 2-nitrosobenzothiazoles with several substituted anilines were synthesized and characterized. The influence of solvent polarity on absorption spectra was examined, as was the relationship between dye structures and absorption in the UV–visible region. Azobenzothiazole dyes possessing an anilino unit which possessed an o-electron donating group, displayed unique absorption properties as revealed by a second, long wavelength absorption band.     

水溶性吲哚菁染料的合成、光谱性能及其应用的研究

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。     

New 2,2-difluoro-1,3,2(2H)oxazaborines and merocyanines derived from them

Synthetic methods have been developed to prepare oxazaborines, the azaanalogues of 2,2-difluoro-1,3,2(2H)dioxaborines, which can form merocyanine dyes. The first oxazaborine merocyanines with the isomeric position of the coordinating nitrogen atom have also been obtained. Comparing the spectral properties of donor-acceptor dioxa- and oxazaborine dyes, it is seen that substitution of the 3-O atom by the NH group in the chelate ring has a slight effect on absorption and fluorescence band positions but causes the intensity redistribution between the 0-0 and 0-1 vibronic absorption peaks and thus induces a change in the absorption band shape due to the enhanced solvation of oxazaborines. Substitution of the 1-O ring atom by the NPh group leads to a bathochromic shift and a manifold increase in the fluorescence quantum yield for the corresponding boron chelate dyes.     

Some properties of dual fluorescence of methine dyes

Studies of the dependence of methine dye absorption and fluorescence properties on the molecular composition of the dyes, on solvent polarity and on the temperature of the sample were made. The results have confirmed our recent suggestion that the emission band of methine dyes in polar solvents is composed of molecular and excimer fluorescence. The spectral properties of different types of molecular composition of methine dyes indicated the centre in the dye molecule involved in excimer formation. On the basis of a liquid nitrogen temperature spectrum and the lifetimes of fluorescence it is suggested that this type of methine dye which can form the excimers has a strong tendency to aggregate in the ground states. These aggregates are able to quench the molecular fluorescence. An increase of solvent polarity causes disaggregation of dye molecules giving an increase of molecular fluorescence and an increased probability of excimer formation. Thus, in polar solvents the long-wavelength emission band arises.