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4 article(s) from Ghosh, Kumaresh

Fluorometric recognition of both dihydrogen phosphate and iodide by a new flexible anthracene linked benzimidazolium-based receptor

Kumaresh Ghosh and
Debasis Kar

Beilstein J. Org. Chem. 2011, 7, 254–264, doi:10.3762/bjoc.7.34

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Graphical Abstract

Figure 1: Synthesized compounds 1 and 2.

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Scheme 1: Synthesis of 1 and 2.

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Figure 2: Energy optimized geometry of 1 with H₂PO₄⁻ (E = 92.14 kcal/mol, a = 2.45 Å, b = 1.94 Å, c = 2.34 Å, ...

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Figure 3: Change in fluorescence emission of 1 (c = 5.78 × 10⁻⁵ M) in the presence of 2 equiv of tetrabutylam...

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Figure 4: Change in emission spectra of 1 (c = 5.78 × 10⁻⁵ M) in presence of increasing amounts of H₂PO₄⁻ in ...

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Figure 5: Suggested modes of binding of the H₂PO₄⁻ ion into the cleft of 1.

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Figure 6: Plot of change in emission of 1 at 420 nm vs the ratio of guest to host concentration in CH₃CN.

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Figure 7: Fluorescence Job plot of 1 with H₂PO₄⁻.

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Figure 8: Change in fluorescence emission of 2 (c = 3.93 × 10⁻⁵ M) in the presence of 1 equiv of tetrabutylam...

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Figure 9: Stern–Volmer plots for 1 (c = 5.78 × 10⁻⁵ M) with H₂PO₄⁻, F⁻, Br⁻ and I⁻ at 420 nm (up to the addit...

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Figure 10: Change in UV–vis spectra of 1 (c = 5.78 × 10⁻⁵ M) in presence of increasing amounts of H₂PO₄⁻ in CH₃...

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Figure 11: Change in fluorescence emission of 1 (c = 5.78 × 10⁻⁵ M) in the presence of 2 equiv of tetrabutylam...

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Figure 12: Stern–Volmer plots for 1 (c = 5.78 × 10⁻⁵ M) with H₂PO₄⁻, F⁻, Br⁻ and I⁻ at 420 nm (up to the addit...

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Figure 13: Fluorescence decays (at λ_max = 420 nm) of receptor 1 upon the addition of H₂PO₄⁻ ion ([H] = 5.78 × ...

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Figure 14: Fluorescence decays (at λ_max = 420 nm) of receptor 1 upon the addition of I⁻ ion ([H] = 5.78 × 10⁻⁵...

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Figure 15: Partial ¹H NMR (300 MHz, CDCl₃ containing 4% CD₃CN) spectra of (a) 1 (c = 1.38 × 10⁻³ M), (b) 1:1 a...

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Full Research Paper

Published 25 Feb 2011

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Anthracene appended pyridinium amide–urea conjugate in selective fluorometric sensing of L-N-acetylvaline salt

Kumaresh Ghosh,
Tanmay Sarkar and
Asoke P. Chattopadhyay

Beilstein J. Org. Chem. 2010, 6, 1211–1218, doi:10.3762/bjoc.6.139

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Graphical Abstract

Figure 1: Synthesized compounds 1 and 2.

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Scheme 1: Syntheses of 1 and 2.

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Figure 2: Change in ¹H NMR of (A) 1 (400 MHz, CDCl₃ containing 0.4% d₆-DMSO; c = 2.80 × 10⁻³ M) and in the pr...

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Figure 3: Change in fluorescence ratio of 1 upon addition of one equivalent of anions (c = 4.31 × 10⁻⁵ M) at ...

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Figure 4: Change in emission of 1 (c = 4.31 × 10⁻⁵ M) upon gradual addition of tetrabutylammonium salts of (a...

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Figure 5: Suggested modes of binding of the amino acid salts into the open cleft of 1.

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Figure 6: Fluorescence titration curves for 1 (c = 4.31 × 10⁻⁵ M) at 492 nm.

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Figure 7: Fluorescence decays (at λ_max = 420 nm) of receptor 1 upon the addition of 1 equiv of L-N-acetylvali...

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Figure 8: Change in absorbance of 1 (c = 4.31 × 10⁻⁵ M) upon gradual addition of tetrabutylammonium salts of ...

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Figure 9: DFT optimized geometry of the complex of 1 with L-N-acetylvaline carboxylate salt [a = 1.93 Å, b = ...

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Letter

Published 21 Dec 2010

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Anthracene coupled adenine for the selective sensing of copper ions

Kumaresh Ghosh and
Tanushree Sen

Beilstein J. Org. Chem. 2010, 6, No. 44, doi:10.3762/bjoc.6.44

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Graphical Abstract

Scheme 1: Adenine-based receptors 1 and 2.

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Scheme 2: Syntheses of receptors 1 and 2.

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Figure 1: Design principle for 1 and 2.

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Figure 2: AM1 optimized geometries of 1 (E = −162.48 au) of 2 (E = −139.59 au).

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Figure 3: a) Fluorescence ratio (I-I₀/I₀) of receptor 1 (c = 5.09 × 10⁻⁵ M) at 413 nm upon addition of 20 equ...

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Figure 4: Emission spectra of receptor 1 (c = 5.09 × 10⁻⁵ M) during titration with Cu²⁺ ion (c = 1.4 × 10⁻³ M...

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Figure 5: a) Emission spectra of receptor 2 (c = 1.48 × 10⁻⁵ M) during titration with Cu²⁺ ion (c = 4.4 × 10⁻⁴...

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Figure 6: Stern–Volmer plot of receptor 2 (c = 1.48 × 10⁻⁵ M) at 413 nm upon addition of 20 equiv of a partic...

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Figure 7: Change in emission of 1 (c = 8.66 × 10⁻⁵ M) (a) and 2 (c = 1.29 × 10⁻⁴ M) (b) upon addition of 10 e...

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Figure 8: a) Binding constant curve for 1 with Cu²⁺ ion; b) binding constant curve for 2 with Cu²⁺ ion.

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Figure 9: a) Absorption spectra of receptor 1 (c = 5.09 × 10⁻⁵ M) upon gradual addition of Cu²⁺ ion (c = 1.4 ...

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Figure 10: a) Absorption spectra of receptor 2 (c = 1.48 × 10⁻⁵ M) upon gradual addition of Ag⁺ ion (c = 4.4 ×...

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Figure 11: Absorption spectra of anthracene (c = 2.39 × 10⁻⁵ M) upon gradual addition of Cu²⁺ ion (c = 1.20 × ...

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Full Research Paper

Published 05 May 2010

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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

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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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