The microwave-assisted coupling-isomerization reaction (MACIR) opens a straightforward domino access to 2-styryl quinolines in good to excellent yields. The pushâpull character of these lumophores can be enhanced by placing a dimethyl amino group as an auxochrome in the para-position of the styryl moiety whereas anti-auxochromes are located in the 6-position of the quinoline part. The optical absorption and emission properties of the compounds were studied in solvents of different polarity and at various pH. The pronounced proto- and solvochromicity of the absorption and emission properties qualify them as luminescent pH sensors with âONâOFFâONâ emission profiles triggered by pH variation over a broad pH range. The electronic structure of the chromophores is rationalized by DFT calculations.
微波辅助偶联-异构化反应(MACIR)开辟了一种直接获得 2-
苯乙烯基
喹啉类化合物的多米诺途径,产量从良好到极佳。通过将二甲基
氨基作为辅助色素置于
苯乙烯基分子的对位,而将反辅助色素置于
喹啉部分的 6 位,可以增强这些发光体的推拉特性。研究人员在不同极性和不同 pH 值的溶剂中对这些化合物的光学吸收和发射特性进行了研究。这些化合物的吸收和发射特性具有明显的原色和溶色性,因此可用作 pH 值发光传感器,其 "ONâOFFâONâ "发射曲线可在广泛的 pH 值范围内由 pH 值变化触发。发色团的电子结构通过 DFT 计算得到了合理解释。