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Colorimetric fluoride ion sensing by boron-containing pi-electron systems
S Yamaguchi1, S Akiyama, K Tamao
1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
Journal of the American Chemical Society
|November 15, 2001
Summary
New boron-based compounds act as selective fluoride sensors. They exhibit distinct color changes and spectral shifts upon fluoride binding, enabling sensitive detection.
Area of Science:
- Materials Science
- Analytical Chemistry
- Organic Chemistry
Background:
- Boron-containing pi-conjugated systems offer unique electronic properties.
- Development of selective chemosensors is crucial for detecting specific ions.
Purpose of the Study:
- Investigate novel boron-containing pi-conjugated systems as fluoride chemosensors.
- Characterize the sensing mechanism and selectivity of these compounds.
Main Methods:
- Synthesis and characterization of tri(9-anthryl)borane (1) and tris[(10-dimesitylboryl)-9-anthryl]borane (2).
- UV-visible absorption spectroscopy to monitor complexation with fluoride ions.
- Binding studies to determine selectivity and affinity for various anions.
Main Results:
- Compound 1 showed a distinct color change (orange to colorless) and spectral shifts upon fluoride complexation.
- High binding constant for fluoride [(2.8 +/- 0.3) x 10(5) M(-1)] with low affinity for acetate and hydroxide.
- Compound 2 exhibited multistage spectral changes due to stepwise fluoride complexation.
Conclusions:
- Tri(9-anthryl)borane (1) functions as a selective and sensitive chemosensor for fluoride ions.
- The sensing mechanism involves the interruption of pi-conjugation upon fluoroborate formation.
- Multiboron systems like compound 2 offer potential for complex anion sensing applications.
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