The Studies On Alkoxy Chromone (acyl) Hydrazone Ligands As Aluminum And Zinc Ion Fluorescent Probe

In this paper, we have designed and synthesized five flavonoid Schiff-Base derivatives. The fluorescence properties of the ligands for metal ions have been studied carefully. This paper is composed of five chapters; the main contents are as follows:In the first chapter, we make a brief description for flavonoids compounds, fluorescent sensors and the research status of detection of metal ions.In the second chapter, we prepared a simple probe 7-methoxychromone-3-carbaldehyde-(pyrid-3’-formyl) hydrazone (MCNH). The sensor exhibited high selectivity in the presence of aluminum ion. Ligand was non-fluorescence, upon binding of aluminum ion, a significant fluorescence enhancement over 800 times was triggered. In addition, this ligand can also be used as a potential colorimetric probe in the detection of aluminum ion, which was easily observed by the naked eye. It was considered to be a multifunction probe for detection of aluminum ion under fluorescence and visible light.In the third chapter, two similar structure aluminum ion fluorescent sensor,7-methoxy chromone-3-carbaldehyde-(indole-2’-formyl) hydrazone (MCIH1),7-methoxychromone-3-carbal dehyde-(indole-3’-formyl) hydrazone (MCIH2), have been designed and synthesized in a simple procedure. Through the experiment showed that the selectivity of MCIH2 was better than MCIH1, the detection limit of MCIH1 to aluminum ion was as low as 10-8M level.In the fourth chapter, we designed and synthesized Schiff-base ligand of 7-methoxychromon e-3-carbaldehyde-(pyrrole-2’-formyl) hydrazone (MCPY). Upon the addition of various metal ions, only aluminum ion gave rise to fluorescence enhancement and with high selectivity in ethanol system. At the same time, the probe has excellent competition, when added other metal ions, relatively low effect was observed for the detection of aluminum ion. The mechanism of the sensor was CHEF procedure generated along with PET procedure suppressed simultaneously.In the last chapter, a novel fluorescent sensor (RC) based on 6-ethoxychromone-3- carbaldeh yde-(rhodamine 6G) hydrazone can selectively sensed aluminum ion and zinc ion, respectively. The probe detect aluminum ion due to the ring-opening reaction of rhodamine in solution of acetonitrile and water. However, the sensor monitor zinc ion was due to PET process in solution of ethanol and water. The probe has low detection limit, high sensitivity, and no interference with each other. Besides, the complex of RC-Zn could be used as fluorescence probe for the detection of aluminum ion on the basis of FRET mechanism and have a good value of application.