Synthesis, Characterization And Properties Study Of Novel Chemosensors Based On Schiff-base And Secondary Amine

Molecular recognition is one of the core contents of supramolecular chemistry. Some of the supramolecular photochemical sensing molecules can detect the particular analysis substrates quickly, with high selectivity, good sensitivity, simplicity as well as other advantages. In the poisonous chemical monitoring and environmental science, the job of designing and synthesizing photochemical sensing molecules for detecting metal ions and certain anions has become one of the most popular spots of the research areas. In this thesis, we have designed and synthesized six novel receptors, and studied on their cations and anions’recognition properties. Finally we hold a preliminary research into two of the six receptors on their logical identification system and the practical application. The major contents are as follows:Chapter1:Former researches into the development of molecule recognition are briefly reviewed, which is followed by a summary of the mechanism of the fluorescence molecular probe detecting objects. On this basis, the aim of this dissertation is presented.Chapter2:A new sensor molecule L1was synthesized, and then we studied on its cations and anions’recognition properties. The result showed that the sensor molecule had selectivity for Mg2+, and for anions F" and Ac". Afterwards, we studied the reaction mode of L1and Mg2+. And then’OR’logical gate was set up for F’and Ac’in relation to the receptor L1, thus a logical recognition system was formed. Derivative L1’ was then synthesized by L1and the intermediate2-Methylamino thiourea. After that we found cations and anions of L1’had no selectivity for metal ions and anions. Then we synthesized the compound GdL1to examine the properties of detecting anions.Chapter3:A new ligand L2was obtained via L1being deoxygenize. Then we studied on recognition properties of the cations and anions of L2. It displayed high selectivity and sensitivity for the Al3+, characterized by UV and fluorescence analysis method. Derivative L2’was synthesized by L2and the intermediate, and then we studied on recognition properties of its cations and anions. The result showed that the receptor had good selectivity for Mg2+. We also studied reaction mode of L2’and Mg2+. Chapter4:The synthesis of chemosensor L3for recognizing Cu2+. The structure of L3was characterized by elemental analysis, FT-IR,1and3CNMR methods. It displayed high selectivity and sensitivity for the Cu2+, demonstrated by UV and fluorescence analysis methods. The1:1binding ratio of the sensor with Cu2+was revealed using Job’s Plot method.