Phenothiazine-based porous organic polymers with high sensitivity and selective fluorescence response to mercury ions

• Published in: Journal of solid state chemistry Vol. 315; p. 123522
• Main Authors: Wang, Hongyu, Qiu, Na, Kong, Xiangfei, Hu, Zhenguang, Zhong, Fuxin, Tan, Haijun
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.11.2022
• Subjects: Fluorescence response; Mercury ion detection; Phenothiazine; Porous organic polymer; Porous organic polymer; Mercury ion detection; Fluorescence response; Phenothiazine
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2022.123522

A new Porous Organic Polymer (POP), termed CTF-PTZ, was synthesized through polymerization of 10-methyl-10H-phenothiazine-3,7-dicarbonitrile in the presence of trifluoromethanesulfonic acid catalyst. Owing to the richness of heteroatoms such as N and S atoms in its molecular structure, the fluorescence response of CTF-PTZ to metal ions was studied, and it was found that CTF-PTZ had a specific fluorescence response to Hg2+. Thus, high selectivity in fluorescence responsiveness to Hg2+ of CTF-PTZ was revealed and the detection limit of it was up to be 2.09 ​× ​10−7 moL·L−1, which was found by fluorescence spectroscopy titration and fluorescence competition experiments. We successfully demonstrated that the fluorescence responsive POP material provides the promising potential for Hg2+ detection. The TOC figure means that the fluorescence intensity of the CTF-PTZ in DOX solution decreases with the increase of mercury ion concentration, and can be directly observed with naked eye. To visually display the internal structure of CTF-PTZ, we also include its molecular structure. After that, the detection limit of mercury ions was calculated to be 2.09 ​× ​10−7 ​mol ​L−1 ​by titration experiment. [Display omitted] •A novel phenothiazine-based porous organic polymer (CTF-PTZ) was successfully prepared.•Fluorescence-selective polymer was synthesized by using low-cost materials under mild conditions.•CTF-PTZ has a specific fluorescence response to Hg2+ and the detection limit of it was up to be 2.09 ​× ​10−7 moL·L−1.