聚乙烯醇
化学
学位(音乐)
自愈水凝胶
荧光
酒
配位复合体
高分子化学
有机化学
物理
量子力学
声学
金属
作者
Qingxin Yang,Zhiming Yang,Fengniu Lu,Hanbing Ge,Yi Du,Ding Cao,Zhiqin Yuan,Chao Lu
标识
DOI:10.1021/acs.analchem.3c05831
摘要
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)-Zn2+ complex as the reporter. The mechanism study disclosed that the strong coordination between −OH and Zn2+ induced the capture of the QPM-Zn2+ complex and promoted its subsequent immobilization into the noncrystalline area. The immobilization of the QPM-Zn2+ 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.
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