Derivatives Modified Of Aldehyde Substituted Conjugated Polymers And Properties’ Investigation

In this paper, two type of conjugated polymer included segments of fluore-triphenylamine-TPE（P1） and fluore-triphenylamine（P2） have been successfully synthesized by Suzuki coupling reaction. Then, the polymers were modified by special groups having ion recognition function. Meanwhile, their optical performances were systematically studied. When tested with the small molecule, we found DBPT had the ability to distinguish Hg²⁺ from other cation ions and can be used as the Hg²⁺ fluorescent probe. The specific research results are as follows:1. 4-（diphenylamino）-benzaldehyde and barbituric acid were combined by practical-simple Knoevenagel reaction, and its optical performances were systematically studied. Surprisingly, DBPT displayed interesting aggregation-induced emission enhancement in THF（good solvent）-water（poor solvent） system. Barbituric acid’s imide is similar to thymine with the ability to distinguish Hg²⁺ and induced aggregation-induced emission enhancement of DBPT, which suggest that DBPT displayed high selectivity, acceptable sensitivity and good anti-interference toward Hg²⁺, and the detection limit were found to be ³.4×10-6 M.2. On the preliminary study of DBPT, barbituric acid has the ability to distinguish Hg²⁺. Based on this, a barbituric acid substituted conjugated polymer P2 was successfully synthesized, and its optical properties was further studied. The results implied P2 can distinguish S^2- with good selectivity, sensitivity and anti-interference, working as the model of “ratiometric”, and the detection limit was evaluated to be ¹.24×10-7 M.3. The polymer backbone was continuing to be modified by higher activity aldehyde group. Finally, pyrazolone, hydroxylamine hydrochloride and coumarin hydrazide were successfully introduced into the polymer, and their optical properties were further studied using functional groups’ specific ion distinguish ability.