کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1235280 | 968844 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A fluorescent fluoride ion probe based on a self-organized ensemble of 5-hydroxyflavone–Al(III) complex A fluorescent fluoride ion probe based on a self-organized ensemble of 5-hydroxyflavone–Al(III) complex](/preview/png/1235280.png)
In the presence of Al(III) ions, 5-hydroxyflavone (5HF) through a complexation reaction in MeOH, shows dual fluorescence, characterized by a newly developed peak at 554 nm upon excitation at 363 nm. In this communication, the subsequent ligand exchange reaction of the complex with fluoride ion causing a fluorescence enhancement followed by a decrease in fluorescence intensity involving an intermediate mechanistic pathway, delivering a quantitative estimation route for fluoride ion in the concentration range from 5 × 10−5 to 7 × 10−4 M, has been reported. The ligand exchange reaction, without interference from other common anions, has been investigated by UV–vis and fluorescence spectroscopies combined with the AM1 semi-empirical self-consistent field quantum chemical calculations within UHF formalism in their ground state.
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 69, Issue 1, January 2008, Pages 282–285