11H-Pyrido[2,1-b]quinazolin-11-one - A reversible turn-on/off fluorescent probe for solution and gas-phase detection of acids or basic amines
作者:João Victor L. Silva Néto、Rodolfo I. Teixeira、Ramon B. da Silva、Nanci C. de Lucas、Simon J. Garden
DOI:10.1016/j.dyepig.2021.109536
日期:2021.9
but when measured in buffered aqueous solutions the spectra were observed to be pH-dependent. Additionally, the emission spectra recorded in different organic solvents revealed only minor differences between the solvents and a moderate fluorescence quantum yield. However, the emission spectrum of 1 revealed a pH-dependent behavior. At pH 7 the emission spectrum was similar to that in acetonitrile, whereas
本研究详细介绍了 11 H -pyrido[2,1 - b ]quinazolin-11-one ( 1 )的无金属和无溶剂合成及其作为酸或碱敏感传感器的光物理特性。有机溶剂中的吸收光谱显示出从非极性溶剂到极性溶剂的小蓝移,但在缓冲水溶液中测量时,观察到光谱与 pH 值有关。此外,在不同有机溶剂中记录的发射光谱仅显示溶剂之间的微小差异和中等荧光量子产率。然而,发射光谱1揭示了 pH 依赖性行为。在 pH 7 时,发射光谱类似于乙腈,而在 pH 1 时,发射强度猛增,而在 pH 14 时,荧光被关闭。通过控制 pH 值可逆地打开和关闭1的发射。吸附量1二氧化硅圆盘上的 提供了一种检测气相酸或碱性胺的简单方法。将圆盘暴露于 AcOH、HCl 或 TFA 蒸气显示发射光谱强度区域随酸增加。暴露于酸蒸气(开启荧光)的圆盘通过暴露于氨或其他挥发性胺(关闭荧光)而易于回收。修改后的二氧化硅盘可以循环打