The Preparation And Application Of Copper (â…¡) Ion Fluorescent Sensor

Fluorescent chemosensors are a kind of molecular devices when they interact with ions or molecules, they can emit fluorescence signals. Fluorescent chemosensors are welcomed by the people, because they can emit visible fluorescent signal easily. Meanwhile, fluorescence signals are very sensitive, so the detection limit of fluorescent chemosensors is often low. The proper design and synthesis of fluorescent chemosensor with high selectivity and good sensitivity is very important.Copper is a kind of trace heavy metal element in the body of animals and plants. Excessive copper ions can cause various diseases. In addition, the copper ions on the environment pollution are very serious, so the effects of copper ions in biological and environmental aspects have been caused more and more attention by people. Classical analysis methods, such as atomic absorption spectrometry and inductively coupled plasma mass spectrometry, have been used widely. However these instruments are expensive, complex operation and not on-site real-time detection. Different from these techniques, the fluorescent chemosensors have advantages of simple and rapid. The research target of this paper is to design and synthesis a fluorescent chemosensor that can selectively identify Cu2+.In the second chapter, with rhodamine B and2-hydrazine pyridine as the starting materials, a fluorescence chemosensor C for copper ion is synthesized with high selectivity, and its structure has been characterized.In the third chapter, the properties and applications of fluorescent chemosensor for copper ion are discussed in detail. Under the optimum conditions, the selectivity of sensor C is best for copper ion, and the common metal ions have no significant interference on copper ion determination. The plot is almost linearly proportional to the concentration of copper ion in the range of0.5μM～3.0μM, the standard curve for determination Cu2+is y=2.1447+3.0131x (R2=0.9912). The recovery rate for determination Cu2+in simulation samples with this sensor is between98.86%and102.72%.