Studies On The Syntheses,structures And Properties Of Bis(Salamo-type) Metal Complexes And The Zn(Ⅱ) Complex Fluorescence Chemosensor

In many fields such as scientific research and industrial and agricultural production,environmental protection, chemical quantity detection and control technology is becoming more and more widely used, and chemical sensor is the first part of this process. The application of chemical sensors has been deepened in all aspects of modern life, the preservation and monitoring of the environment, the prevention of disasters and the occurrence of diseases, and it is still the main areas of the chemical sensor application in a long time. Salen and Salamo compounds are versatile chelate ligands, and their metal complexes play an important role in the fields of structure, stereochemistry, magnetism,stereoisomerism, coordination chemistry, spectroscopy, analytical chemistry, catalysis,electro-optical display, photography, agriculture and photochromism. In this paper, the supramolecular structure and properties of the long chain Salamo-type ligand based on a naphthalene ring, especially the supramolecular ligand and complexes as the fluorescence chemosensor, have been studied in detail, and finally we got two fluorescent chemistry sensors with an application prospect. The full text is divided into four chapters for discussion.1. This section focuses on the research background of our research. The development of supramolecular field is introduced, including the research status of Salen type and Salamo type compounds, the research status of fluorescent chemosensors, the mechanism of sensor subject recognition and the representative examples. In addition, the significance of the topic selection is expounded.2. We designed and synthesized a naphthalenediol-based bis(Salamo)-type tetraoxime fluorescent relay-sensor (H4L),and the structure of the L-Zn2+ complex has been determined by X-ray crystallographic analysis. The structures and properties of the ligand and its three metal complexes were determined by means of nuclear magnetic spectrometry, melting point analyzer, UV-Vis spectroscopy, fluorescence spectrometer and single crystal diffractometer.We analyzed the structures of metal complexes and analyzed the forces between molecules and molecules, as well as the one-dimensional and two-dimensional configurations between molecules. The ratio of ligand to metal ions was determined by UV-visible titration experiments.3. The ligand H4L for the selective sensing of Zn2+/Pic- in a water-containing organic solvent have beed studied. Moreover, the sensitivity and stability of the L-Zn2+ complex meet the requirements of the sensors. By the above results, the relay-sensor can be applied in the water quality detection system for Pic- recognition owing to its three advantages namely:"Wide pH range adaptability; Excellent stability; and Rapid identification".4. We explored the possibility of the ligand and its zinc (II) complex as pH fluorescence chemosensors. Changes in fluorescence spectra response to the H+/OH- can act as on/off switch. The fluorescence of the H4L switches in two ways (① OFF-to-ON-to-OFF-to-ON and ② OFF-to-ON-to-OFF-to-ON-to-OFF) when the ions (① Zn2+, H+ and OH-,② Zn2+,Pic-, OH- and H+) were added.