新型不对称苯并噻唑三次甲基菁染料的合成及光稳定性研究

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.

Investigation on Synthesis and Photostabilities of Novel Asymmetric Benzothiazole Trimethine Cyanine Dyes

Novel asymmetric trimethine benzothiazole cyanine dyes with different N-substituents were synthesized and characterized by MS and 1H NMR techniques.The maximums of absorption and emission spectra of the dyes in ethanol were in the range of 628～631 and 662～666 nm,respectively.The dyes were almost non-fluorescent in solvents,which can reduce the background interference greatly.The photodegradation experiment showed that the octyl group on quinoline ring and benzyl group on benzothiazole ring improved the photostabilites of the dyes obviously.The rate constants of photoreaction of the dyes 8a～8d were 6.38×10-4,12.5×10-4,2.68×10-4 and 6.30×10-4 mol min-1,respectively.Oxidation potentials were determined by cyclic voltammetry.