A highly selective fluorescent sensor for Hg2+ based on the water-soluble poly(p-phenyleneethynylene)

✍ Scribed by Jie Li; Jie Meng; Xiaobo Huang; Yixiang Cheng; Chengjian Zhu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 577 KB
• Volume: 51
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/j.polymer.2010.05.038

✦ Synopsis

The conjugated polymer P-1 could be synthesized by the polymerization of 4,7-diethynyl-benzo[2,1,3] thiadiazole (M-1) and 1,4-bis[3 0 -(N,N-diethylamino)-1 0 -oxapropyl]-2,5-diiodobenzene (M-2) via Pdcatalyzed Sonogashira reaction. The water-soluble conjugated polyelectrolyte P-2 could be obtained by the reaction of P-1 with ethyl bromide. Both P-1 and P-2 can emit orange fluorescence. The responsive optical properties of P-1 and P-2 on Hg 2þ were investigated by fluorescence spectra. Hg 2þ can lead to nearly complete fluorescence quenching of P-1. On the contrary, Hg 2þ can show the most pronounced fluorescence enhancement response of P-2 in aqueous solution without interference from those coexistent ions, such as K þ , Mg 2þ , Pb 2þ , Co 2þ , Ni 2þ , Ag þ , Cd 2þ , Cu 2þ , Fe 3þ and Zn 2þ . The results also exhibit that this kind of water-soluble conjugated polyelectrolyte can be used as a highly sensitive and selective fluorescence sensor for Hg 2þ detection in water.