کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4765980 | 1423894 | 2017 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: H-bond stabilization of a tautomeric coumarin-pyrazole-pyridine triad generates a PET driven, reversible and reusable fluorescent chemosensor for anion detection H-bond stabilization of a tautomeric coumarin-pyrazole-pyridine triad generates a PET driven, reversible and reusable fluorescent chemosensor for anion detection](/preview/png/4765980.png)
- A novel fluorescent coumarin-pyrazole-pyridine triad (1) was synthesized and characterized for detection anions.
- 1 has remarkable sensitivity for fluoride detection in DMSO at the stoichiometric ratio of 1:1.
- 1 exhibits naked-eye visible ON-OFF-ON states.
- 1 exhibits acidochromic property and significant “light-up” effect is observed after interaction 1 with TFA in CH2Cl2.
A coumarin based anion sensor utilizing pyrazole both as an electron donor and hydroxyl H-bond donor and pyridine as a tautomer stabilizer is reported. The chemosensor exhibits ON-OFF-ON states and is more sensitive to Fâ at the stoichiometric ratio of 1:1. The OFF state is due to PET and the role of pyrazole is two fold, both stabilization of the enol tautomer via H-bonding and hosting domain of electrons enabling PET. Moreover, the absorption and emission properties of chemosensor change drastically upon acidification.
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Journal: Dyes and Pigments - Volume 141, June 2017, Pages 493-500