Synthesis Of Two Kinds Of Conjugated Polymers For Detecting Metal Ions

Heavy and transition metal ions widely exist in the nature and are also widely used in industrial production processes. Some of them play very important roles in the living system, others have high toxicity to the living plants and animals even in the low concentration. As a result, it is significant to detect these ions effectively in the fields of biochemistry, environmental science, medical science and so on. Traditional fluorescence sensors for detecting metal ions which usually based on small organic molecules can not meet the requirements of people because of their low sensitivity. While fluorescent conjugated polymers have the signal amplification effect, high selectivity and sensitivity fluorescence sensors can be improved by appending some groups which can recognize metal ions on the conjugated polymers. Based on the above, this thesis made the following work:1.Polyparaphenylenebenzobisoxazole (PBO) contains lots of N atoms and O atoms which are excellent metal ion binding sites,but the poor solubility limits its application. In this thesis, two ramifications of PBO of good solubility(P1and P2)were designed and synthesized by copolymerization of9,9-dihexyl-9H-flourene-2,7-dicarboxylic acid,9,9-didecyl-9H-flourene-2,7-dicarboxylic acid and4,6-Diami-noresorcinol hydrochloride. Their structure was confirmed by FT-IR and H-NMR. The molecular weight, thermal properties and optical properties of these polymers are characterized by GPC, TG, UV-vis, FL. the effect of different metal ions and polymer interaction on the solution fluorescence was focused on. The results showed that only Sn2+caused the fluorescence of the solution of P1and P2quenching significantly.2. Poly(p-phenylene ethynylene)(PPE) containing a rigid structure is not conducive to the preparation of fluorescent sensors because of its poor solubility and meltbility. The imino and crown eher are excellent metal ion binding groups, due to this, a ramification of PPE (P3) of good solubility was designed and synthesized by copolymerization of phenylene diacetylene with crown ether and N-cetyl-2,5iodine aniline. Its structure was confirmed by FT-IR and1H-NMR. The molecular weight, thermal properties and optical properties of this polymer was characterized by GPC, TG, UV-vis, FL. the effect of different metal ions and polymer interaction on the solution fluorescence was focused on. The results showed that only Co2+and Sn2+caused the fluorescence of the solution of P3quenching significantly, while Co2+caused a stronger fluorescence quenching than Sn2+...