| Autor: |
Yang Q; State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China., Yang Z; State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China., Lu F; Department of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China., Ge H; State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China., Du Y; Analysis Center, Department of Chemistry, Tsinghua University, Beijing 100084, China., Cao D; State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China., Yuan Z; State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China., Lu C; State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China.; Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China. |
| Abstrakt: |
Polyvinyl alcohol (PVA) with abundant hydroxyl groups (-OH) has been widely used for membranes, hydrogels, and films, and its function is largely affected by the alcoholysis degree. Therefore, the development of rapid and accurate methods for alcoholysis degree determination in PVAs is important. In this contribution, we have proposed a novel fluorescence-based platform for probing the alcoholysis degree of PVA by using the ( E )- N -(4-methoxyphenyl)-1-(quinolin-2-yl)methanimine (QPM)-Zn 2+ complex as the reporter. The mechanism study disclosed that the strong coordination between -OH and Zn 2+ induced the capture of the QPM-Zn 2+ complex and promoted its subsequent immobilization into the noncrystalline area. The immobilization of the QPM-Zn 2+ complex restricted its molecular rotation and reduced the nonirradiative transition, thus yielding bright emissions. In addition, the practical applications of this proposed method were further validated by the accurate alcoholysis degree determination of blind PVA samples with the confirmation of the National Standard protocol. It is expected that the developed fluorescence approach in this work might become an admissive strategy for screening the alcoholysis degree of PVA. |
