A colorimetric and “turn-on” fluorescent chemosensor for Zn(II) based on coumarin Shiff-base derivative

✍ Scribed by He-yang Li; Shuang Gao; Zhen Xi

• Book ID: 118460328
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 403 KB
• Volume: 12
• Category: Article
• ISSN: 1387-7003
• DOI: 10.1016/j.inoche.2009.01.013

✦ Synopsis

Turn-on" fluorescence Zn(II) ion a b s t r a c t A coumarin Shiff-base derivative, 7-hydroxy-3-(2-hydroxybenzylideneamino)-2H-chromen-2-one (CSB), was obtained by simple two-step organic synthesis from cheap and commercially available starting materials. CSB has nearly no fluorescence in CH 3 CN solution. However, in the presence of Zn(II) ion, a ''turn-on" fluorescence was observed. Other metal ions in CSB solution show very little emission or do not show any emission. CSB can also be used as a colorimetric chemosensor for Zn(II), which is easily observed from colorless to yellow by the naked eye. The absorption maximum of CSB shows a large red shift from 374 to 452 nm upon addition of Zn(II).