The fluorophore 2,6-bis(2-methoxyphenyl)dithiazolo[4,5-b:5′,4′-e]pyridine) 3, with a planar structure, was synthesized using a one-pot Willgerodt–Kindler reaction which is potentially applicable to various dithiazolopyridines. The basic photophysical characteristics were investigated in organic solvents of different polarity. Chemosensor 3 exhibits a ‘turn-off’ response toward Cu²⁺ and Fe³⁺ ions, as well as a new emission wavelength-ratiometric response to H⁺ ions, illustrating a different recognition manner. From the binding constant calculations of 3 with Cu²⁺, increased sensitivity for the fluorescence method over that of the UV–vis method was found, while both methods showed similar sensitivity for binding of 3 with H⁺. On the other hand, the different behavior in the complexes of 3·H⁺ and 3·Cu²⁺ under cyclic voltammetric analysis was observed. These findings suggest that compound 3 may have potential as a sensor for water pollution by Cu²⁺ and Fe³⁺ ions as well as protons.

使用一锅Willgerodt-Kindler反应合成具有平面结构的2,6-双（2-甲氧基苯基）二噻唑并[4,5- b：5'，4'- e ]吡啶）3荧光团。可能适用于各种二噻唑并吡啶。在不同极性的有机溶剂中研究了基本的光物理特性。化学传感器3表现出对Cu ²⁺和Fe ³⁺离子的“关闭”响应，以及对H ⁺离子的新发射波长比测量响应，说明了一种不同的识别方式。从3与Cu ²⁺的结合常数计算，发现荧光方法的灵敏度比UV-vis方法的灵敏度提高，而两种方法对3与H ^+的结合均显示出相似的灵敏度。另一方面，在循环伏安法分析下观察到了3 ·H ⁺和3 ·Cu ²⁺的配合物的不同行为。这些发现表明，化合物3可能具有被Cu ²⁺和Fe ³⁺离子以及质子污染水的传感器的潜力。