Four monomethine cyanine dyes were synthesized and their structures were confirmed by 1H NMR, IR, UV–Vis, and HRMS. Their spectral properties were studied. It could be found that the λmax of the dyes was shorter in the protonic solvents compared with that in the non‐protonic solvents. Moreover, the λmax shows a hypsochromic shift with the increasing polarity of the solvents. The interactions of four dyes with DNA were also studied. The results showed that the fluorescence intensities of the dyes 3a and 3b took place a qualitative change in the presence of DNA compared with the free dyes. The dyes used as cellular imaging agents were researched. The results indicated that the dye 3b could penetrate the live cell membrane.
合成了四种一甲基氰基染料,并通过 1H NMR、IR、UV-Vis 和 HRMS 确认了它们的结构。研究了它们的光谱特性。研究发现,与在非质子溶剂中相比,染料在质子溶剂中的λmax 更短。此外,随着溶剂极性的增加,λmax 出现了低色移。还研究了四种染料与 DNA 的相互作用。结果表明,与游离染料相比,染料 3a 和 3b 在 DNA 存在时的荧光强度发生了质的变化。研究了用作细胞成像剂的染料。结果表明,染料 3b 可以穿透活细胞膜。