A colorimetric sensor for the selective detection of fluoride ions
Chin-Feng Wan1, Jiun-Ly Chir2, An-Tai Wu2
1Department of Medical Applied Chemistry, Chung Shan Medical University, Taichung City, 40201, Taiwan.
Summary
A novel colorimetric receptor L was developed for selective fluoride ion (F-) detection. This receptor utilizes intramolecular hydrogen bonding for sensing, showing distinct color changes in the presence of F-.
Area of Science:
- Chemical Sensing
- Analytical Chemistry
- Supramolecular Chemistry
Background:
- Selective ion detection is crucial in environmental and biological monitoring.
- Colorimetric sensors offer a simple and visual method for analyte identification.
- Fluoride ion (F-) sensing remains a significant challenge due to its reactivity and small size.
Purpose of the Study:
- To design and synthesize a novel colorimetric receptor, designated L.
- To investigate the selective sensing capabilities of receptor L for fluoride ions (F-) among various anions.
- To elucidate the sensing mechanism and quantify the binding interaction between receptor L and F-.
Main Methods:
- Preparation and characterization of colorimetric receptor L.
- Spectrophotometric analysis to observe color changes upon addition of different ions.
- Job plot analysis to determine complexation stoichiometry.
- Stern-Volmer plot analysis to quantify the association constant.
Main Results:
- Receptor L demonstrated selective colorimetric sensing of fluoride ions (F-) over other tested ions.
- The sensing mechanism involves an intramolecular hydrogen bond interaction.
- Job plot analysis confirmed a 1:1 complexation stoichiometry between receptor L and F-.
- The association constant for the L-F- complex in acetonitrile (CH3CN) was determined to be 9.70 × 104 M-1.
Conclusions:
- Receptor L is a highly selective and effective colorimetric sensor for fluoride ions (F-).
- The developed sensor provides a visual and quantitative method for F- detection.
- The study highlights the potential of intramolecular hydrogen bonding in designing selective chemosensors.
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