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Search for "fluorescence quenching" in Full Text gives 76 result(s) in Beilstein Journal of Organic Chemistry.

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Quinoline based receptor in fluorometric discrimination of carboxylic acids

Kumaresh Ghosh,
Suman Adhikari,
Asoke P. Chattopadhyay and
Purnendu Roy Chowdhury

Beilstein J. Org. Chem. 2008, 4, No. 52, doi:10.3762/bjoc.4.52

receptor 1 and its 1:1 complexes with citric, D-(−)-tartaric, D-(−)-gluconic, succinic, glutaric, adipic, sebacic and terephthalic acids. On complexation, fluorescence quenching of the monomer emission occurs significantly with simultaneous generation of a new peak at longer wavelength, presumably due to

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Graphical Abstract

Figure 1: Structures of compounds 1 and 2.

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Scheme 1: Syntheses of receptors 1 and 2.

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Figure 2: UV-vis spectra of 1 (c = 5.05 × 10⁻⁵ M) in different solvents.

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Figure 3: UV-vis spectra of 2 (c = 5.05 × 10⁻⁵ M) in different solvents.

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Figure 4: UV spectra of the complex of 1 with citric acid (c = 1.67 × 10⁻⁵ M) and its change of absorbance on...

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Figure 5: UV spectra of the complex of 1 with D-(−)-tartaric acid (c = 1.67 × 10⁻⁵ M) and its change of absor...

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Figure 6: UV spectra of the complex of 2 with citric acid (c = 1.67 × 10⁻⁵ M) and its change of absorbance on...

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Figure 7: UV spectra of the complex of 2 with D-(−)-tartaric acid (c = 1.67 × 10⁻⁵ M) and its change of absor...

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Figure 8: Fluorescence change of 1 in CHCl₃ in the presence of carboxylic acids (λ_ex = 290 nm).

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Figure 9: Plot of the ratio of excimer to monomer emission vs concentration of the complex of 1 with citric a...

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Figure 10: Fluorescence change of 1 in CHCl₃ (c = 1.67 × 10⁻⁵ M) upon addition of citric acid dissolved in CHCl...

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Figure 11: Fluorescence change of 1 in CHCl₃ (c = 1.67 × 10⁻⁵ M) upon addition of D-(−)-tartaric acid dissolve...

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Figure 12: Fluorescence change of 2 in CHCl₃ in the presence of carboxylic acids (λ_ex = 290 nm).

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Figure 13: Fluorescence change of 2 in CHCl₃ (c = 1.67 × 10⁻⁵ M) upon addition citric acid dissolved in CHCl₃ ...

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Figure 14: ¹H NMR (in CDCl₃) spectra of receptor 1 (c = 3.57 × 10⁻³ M; bottom) and the 1:1 complex with citric...

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Figure 15: AM1 optimized geometries of the complexes of 1 with (a) citric acid, hydrogen bond distances: a = 2...

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Figure 16: AM1 optimized geometry of the complex of 2 with citric acid, hydrogen bond distances: a = 2.12 Å, b...

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Published 17 Dec 2008

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