酸碱性作为物质的一种重要特性，在化学、环境、生物等多个领域中要求精确、实时的检测，而传统的pH测定方法不能满足精确、实时的检测pH值的要求，这使得pH荧光传感器受到了广泛的关注，而喹喔啉稳定的光物理性质使其能够成为一个性能优秀传感器的荧光团。

首先，本文研究合成了两种基于喹喔啉体系的D-A结构的化合物，即DPhQPCz和DPhQMOPA，并进一步研究了它们在光物理性质。由于具有强推拉电子结构，这两种化合物能够在极性溶剂中形成TICT态，使其具有独特的光物理性质。随着溶剂极性的增加，DPhQPCz的最大发射波长从423nm红移到546nm，荧光由紫色变为绿色；DPhQMOPA的最大发射波长从556nm红移到632nm，荧光由黄绿色变为橙红色。此外，这两种化合物具有AIE+TICT双重发光性质，在不同体积分数（f_w）的水/二氯甲烷混合溶剂中，两种化合物荧光强度均显示出先下降后上升的趋势，而最大发射波长则在红移后出现蓝移。

基于喹喔啉的新型酸碱响应传感器DPhQPCz和DPhQMOPA是在共轭电子供体-受体结构的基础上设计的。喹喔啉强大的质子捕获能力使DPhQPCz和DPhQMOPA在碱性和酸性介质中能够发生可逆的荧光信号转化，而AIE+TICT双重性质赋予了这两种化合物独特的光物理性质。在添加TFA的荧光发射光谱中，荧光发生了猝灭，在加入三乙胺（TEA）后，发现DPhQPCz和DPhQMOPA的荧光发射光谱变化是可逆的。最后，本文将DPhQPCz和DPhQMOPA制成了可逆的酸碱响应荧光传感器，并进行了应用实验。

As an important property of substances, acidity and alkalinity require accurate and real-time detection in many fields such as chemistry, environment and biology. Traditional pH determination methods cannot meet the requirement of accurate and real-time detection of pH, which has led to a wide interest in pH fluorescent sensors, and the stable photophysical properties of quinoxaline enable it to be a fluorophore with excellent sensor performance.

Firstly, two compounds based on the D-A structure of the quinoxaline system, namely DPhQPCz and DPhQMOPA, were synthesised and further investigated for their photophysical properties. Due to their strong push-pull electronic structures, these two compounds are able to form TICT states in polar solvents, giving them unique photophysical properties. As the solvent polarity increases, the maximum emission wavelength of DPhQPCz shifts from 423 nm to 546 nm red and the fluorescence changes from purple to green; the maximum emission wavelength of DPhQMOPA shifts from 556 nm to 632 nm red and the fluorescence changes from yellow-green to orange-red. In addition, both compounds have dual luminescence properties of AIE+TICT. In different volume fractions (fw) of water/dichloromethane solvent mixture, both compounds show a decreasing and then increasing trend of fluorescence intensity, while the maximum emission wavelength is red-shifted and then blue-shifted.

New acid-base responsive sensors based on quinoxaline, DPhQPCz and DPhQMOPA, were designed on the basis of a conjugated electron donor-acceptor structure. The powerful proton trapping ability of quinoxaline enables reversible fluorescence signal conversion of DPhQPCz and DPhQMOPA in alkaline and acidic media, while the dual nature of AIE+TICT confers unique photophysical properties to both compounds. In the fluorescence emission spectra of the added TFA, the fluorescence underwent a burst, and after the addition of triethylamine (TEA), the fluorescence emission spectra of DPhQPCz and DPhQMOPA were found to change reversibly. Finally, in this paper, DPhQPCz and DPhQMOPA were made into reversible acid-base responsive fluorescent sensors and application experiments were carried out.