【摘要】 用方酸与不同的N烷基取代吲哚啉季铵盐缩合制备了一系列对称的水溶性方酸菁染料.通过核磁共振氢谱和质谱对合成的染料结构进行了表征,研究了它们在不同溶剂中的吸收和发射光谱.结果表明,随着溶剂极性的增大,染料的吸收光谱发生蓝移,表现为负向溶剂化效应,在极性溶剂中的荧光量子产率比在水中的大.考察了N位取代基对染料水溶液光稳定性的影响,结果表明在吲哚环N原子上引入较大的苄基有助于提高光稳定性,且随着苄基上取代基吸电子能力的增强,染料的光稳定性增强.更多还原

【Abstract】 Six water-soluble squarylium indocyanine dyes were synthesized and their structures were confirmed by 1H NMR and MS spectroscopy.The absorption and emission spectra of these dyes in water,methanol,ethanol,DMF,DMSO were studied.The spectra of these dyes exhibit a negative solvatochromism.The photo stability of these dyes in water was investigated as well.It is demonstrated that the electron-withdrawing group on N-position of cyanine dyes improves the photo stability as compared with the dyes with electron-donating group which decreases the photo stability obviously.更多还原