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Search for "carboxylic acid recognition" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.

On the photoluminescence in triarylmethyl-centered mono-, di-, and multiradicals

Daniel Straub,
Markus Gross,
Mona E. Arnold,
Julia Zolg and
Alexander J. C. Kuehne

Beilstein J. Org. Chem. 2025, 21, 964–998, doi:10.3762/bjoc.21.80

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Graphical Abstract

Figure 1: a) Tris(trichlorophenyl)methyl (TTM) radical and related trityl radicals, b) HDMO, SOMO, LUMO orbit...

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Figure 2: Mixed halide tri- and perhalogenated triphenylmethyl radicals: a) Molecular structures of homo- and...

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Figure 3: Pyridine-functionalized triarylmethyl radicals. a) Chemical structures of X₂PyBTM, Py₂MTM, and Au-F₂...

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Figure 4: Pyridine-functionalized triarylmethyl radicals. a) Molecular structure of Mes₂F₂PyBTM, and b) its f...

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Figure 5: Carbazole functionalized triarylmethyl radical. a) Chemical structure of Cz-BTM and b) its energy d...

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Figure 6: Donor-functionalized triphenylmethyl radicals. Molecular structures of TTM-Cz, DTM-Cz, TTM-3PCz, PT...

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Figure 7: Tuning of the donor strength. Functionalization with electron-donating and electron-withdrawing gro...

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Figure 8: Tuning of the donor strength, by varying the Cz-derived donor (1–36) on a TTM radical fragment. a) ...

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Figure 9: Three-state model and Marcus theory: q is the charge transfer coordinate and G the free energy. Gro...

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Figure 10: Dendronized carbazole donors on TTM radicals. a) Molecular structures of G3TTM and G4TTM. b) Photol...

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Figure 11: Electronic extension of the Cz donor. a) Molecular structures and optoelectronic properties of TTM-...

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Figure 12: Kekulé diradicals: a) hexadeca- and perchlorinated Thiele (TTH, PTH), Chichibabin (TTM-TTM, PTM-PTM...

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Figure 13: Non-Kekulé diradicals: perchlorinated Schlenk–Brauns radical (m-PTH), meta-coupled TTM radicals in ...

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Figure 14: UV–vis absorption and photoluminescence spectra of a) TTH in solvents of different polarity, b) dir...

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Figure 15: Molecular structures of m-4BTH (meta-butylated Thiele hydrocarbon), m-4TTH (meta-trichlorinated Thi...

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Figure 16: a) Polystyrene-based TTM-Cz polymer. b) Molecular structure of radical particles with backbone thro...

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Figure 17: Molecular structures of polyradicals. a) Molecular structures of p-TBr₆Cl₃M-F8, p-TBr₆Cl₃M-acF8 and ...

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Figure 18: Structures of coordination and metal-organic frameworks. a) Carboxylic acid functionalized monomers...

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Figure 19: Structures of coordination and metal-organic frameworks. a) Molecular structures of monomers TTMDI, ...

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Figure 20: Molecular structures of covalent organic frameworks m-TPM-Ph-COF, m-PTM-Ph-COF, p-TPH-COF, p-PTH-COF...

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Figure 21: Molecular structures of covalent organic frameworks PTMAc-COF, oxTAMAc-COF, TOTAc-COF, PTMTAz-COF, p...

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Review

Published 21 May 2025

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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

value and did not form any excimer upon complexation with the same acids under similar conditions. This established the role of quinoline ring nitrogen in binding with the acids. Keywords: carboxylic acid recognition; excimer emission; naphthalene; quinoline; Introduction The sensing and monitoring of

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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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Full Research Paper

Published 17 Dec 2008

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