کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1243648 | 969668 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A ratiometric fluorescent probe for fluoride ion employing the excited-state intramolecular proton transfer A ratiometric fluorescent probe for fluoride ion employing the excited-state intramolecular proton transfer](/preview/png/1243648.png)
A ratiometric fluorescent probe 1 for fluoride ion was developed based on modulation of the excited-state intramolecular proton transfer (ESIPT) process of 2-(2′-hydroxyphenyl)benzimidazole (HPBI) through the hydroxyl group protection/deprotection reaction. The probe 1 was readily prepared by the reaction of HPBI with tert-butyldimethylsilyl chloride (TBS-Cl) and shows only fluorescence emission maximum at 360 nm. Upon treatment with fluoride in aqueous DMF solution, the TBS protective group of probe 1 was removed readily and ESIPT of the probe was switched on, which resulted in a decrease of the emission band at 360 nm and an increase of a new fluorescence peak around 454 nm. The fluorescent intensity ratio at 454 and 360 nm (I454/I360) increases linearly with fluoride ion concentration in the range 0.3–8.0 μmol L−1 and the detection limit is 0.19 μmol L−1. The proposed probe shows excellent selectivity toward fluoride ion over other common anions. The method has been successfully applied to the fluoride determination in toothpaste and tap water samples.
Journal: Talanta - Volume 80, Issue 1, 15 November 2009, Pages 92–97