Synthesis Of The Phosphorescent Probes Based On Iridium (Ⅲ) Complexes And The Detection For Metal Ions

With the further development and deeply study of organic light-emitting materials,fluorescent probes and phosphorescent probes have been attracted much attention. Phosphorescent probe and fluorescent probe are the new materials that have high sensitivity, high selectivity, real-time detection and so on, which generated specific response to the specific targets by the form of an optical signal. Compared with the fluorescent probe, phosphorescent probe based on heavy metal complexes（e.g. iridium（Ir）, platinum（Pt）, ruthenium（Ru）, etc.） has a lot of advantages, such as the long phosphorescence life time, high luminous efficiency, a large Stokes shift, adjustable emission color, and avoiding the interference of the fluorescence coming from the background system by scattering, which is designed to recognize biological molecules, ions and other objects as the outstanding phosphorescent probes. Therefore, the phosphorescent probe has been received extensively attention and research. Especially, the iridium（Ⅲ） complexes have the most obvious advantages.Mercury ions is a toxic heavy metal ions, which can exist in the environment, easily migrates and highly enriches in the organism. If Hg and Hg²⁺ enter the environment, they will be converted to methyl mercury by microorganisms in the water, and the methyl mercury can be rich in organism and not easy to discharge. The methyl mercury can enter human body through the food chain and the methyl mercury accumulated in the human body to a certain extent, it will cause nausea, vomit, abdominal pain, renal injury and the central nervous system damage and other serious harm, and even threat to life. Similarly, the excess of aluminum and aluminum ions in the human body can seriously harm the central nervous system, making people’s memory declined and even suffered from idiopathic Parkinson’s disease and Alzheimer’s disease. Therefore, the detection of mercury ions and aluminum ions have attracted the much attentions to the scientific workers. Phosphorescent probe is more and more popularly used in the detection for ions of the environment in recent years, especially the phosphorescent probes based on iridium complexes have a lot of characteristics of high sensitivity, good selectivity, short response time, simple operation, low cost, easy to use, without pretreatment of the samples, emitting from the long distances, etc. In this thesis, we had synthesized three phosphorescent iridium（Ⅲ） complexes and used as the phosphorescent probes for detection of mercury ions and aluminum ions.In the thesis, firstly the development and detection mechanism of fluorescent probes and phosphorescent probes had been introduced. Secondly, a new phosphorescent probe Ir（¹L）₂（btn）（P1） was synthesized and characterized by mass spectrometry and nuclear magnetic resonance hydrogen spectrum, and was discussed the phosphorescent probe Ir（¹L）₂（btn）（P1） response degree for mercury ion and aluminum ion through the UV absorption spectra and the photoluminescence. The experimental results showed that the phosphorescent probe Ir（¹L）₂（btn）（P1） has high selectivity, high sensitivity and real-time detection for mercury ion and aluminum ion. Thirdly, we synthesized and characterized a new phosphorescent probe Ir（²L）₂（btn）（P2）, and used it as a probe to test the metal ions. The experimental results showed that the probe Ir（²L）₂（btn）（P2） can be highly selective, highly sensitive and real-time detection of mercury ions. In the fourth chapter, we mainly synthesized the probe Ir（³L）₂（btn）（P3） and characterized its structure, exploring the possible mechanism of the ligand detected the mercury ions.