Synthesis And Properties Of Novel Fluorescent Anion Sensors

Because anions and cations commonly exist in physiological processes and nature, they play a very important role in our daily lives. They are necessary in physiological and industrial processes. We can judge whether the drinking water is safe and physiological metabolism is normal through detection of ion content. Fluorescent chemical sensor has received extensive attention for its simple and convenient operation, high selectivity and high sensitivity. Amide is a simple and most efficient testing group in all kinds of fluorescent chemical sensors. It can selectively detect anions by hydrogen bonding. In this thesis, a series of novel sensors employing amine or amide group as receptor and arylmaleimide as fluorophore to detect anions. The main results are summarized as follows:1. The structure, properties, and classification of fluorescent sensors as well as their application in recognition for anions were briefly introduced. The fluorescent sensor detection anions by hydrogen bonding in recent years was reviewed.2. We have designed and synthesized bisindolylmaleimide fluorescent chemical sensors and then detected their sensing ability for anions by a series of experiment. The results have shown that cyanide ion and fluoride ion have the fluorescence quenching effect on these sensors.3. We have designed and synthesized polymer ratiometric fluorescent sensor containing alkyl-fluorene and phenyl-maleimide units. It was found that the fluorescence intensity of polymer sensor was significantly enhanced only when adding fluorine ions, while the other anions did not impose obvious effect on the emission property of polymer sensor. Compared with other fluorescent sensors, the ratiometric fluorescent sensor has higher detection sensitivity and selectivity.