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3 article(s) from Darcsi, Andras

Novel β-cyclodextrin–eosin conjugates

Gábor Benkovics,
Damien Afonso,
András Darcsi,
Szabolcs Béni,
Sabrina Conoci,
Éva Fenyvesi,
Lajos Szente,
Milo Malanga and
Salvatore Sortino

Beilstein J. Org. Chem. 2017, 13, 543–551, doi:10.3762/bjoc.13.52

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Figure 1: Reaction scheme for the synthesis of eosin Y (2) and eosin B (4).

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Figure 2: Reaction scheme for the synthesis of eosin-appended β-CDs, 2–β-CD and 4–β-CD (NMM: N-methylmorpholi...

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Figure 3: TLC analysis of the composition of the crude coupling reaction mixtures.

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Figure 4: ¹H NMR spectrum of 2–β-CD with partial assignment (DMSO-d₆, 600 MHz, 298 K).

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Figure 5: Size distributions of 1 mM aqueous solutions of conjugates 4–β-CD (a) and 2–β-CD (b) at 25.0 °C (pH...

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Figure 6: Normalized absorption spectra of aqueous solutions of (a) eosin Y (2) and (b) conjugate 2–β-CD and ...

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Figure 7: Time-resolved fluorescence observed for aqueous solutions of (a) eosin Y (2) and (b) the 2–β-CD con...

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Figure 8: ¹O₂ luminescence detected upon 528 nm light excitation of D₂O solutions of (a) eosin Y (2) and (b) 2...

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Published 15 Mar 2017

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New synthetic strategies for xanthene-dye-appended cyclodextrins

Milo Malanga,
Andras Darcsi,
Mihaly Balint,
Gabor Benkovics,
Tamas Sohajda and
Szabolcs Beni

Beilstein J. Org. Chem. 2016, 12, 537–548, doi:10.3762/bjoc.12.53

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Figure 1: Structures of fluorescent xanthene dyes. Rhodamine B·HCl 1 and fluorescein disodium salt 2.

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Figure 2: Reaction scheme for the synthesis of rhodamine-appended β-CD.

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Figure 3: TLC plates at different development stages for monitoring the composition of Rho-β-CD crude (left p...

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Figure 4: ¹H NMR spectrum of Rho-β-CD with partial assignments (D₂O, 500 MHz, 298 K).

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Figure 5: Expansion of DEPT-ed-HSQC spectrum of Rho-β-CD with partial assignments (D₂O, 500 MHz, 298 K).

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Figure 6: Cartoon models for the possible intermolecular inclusion mode of Rho-β-CD in solution (3D perspecti...

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Figure 7: ¹H NMR spectrum of Flu-β-CD with partial assignments (D₂O, 500 MHz, 298 K).

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Figure 8: Cartoon models for the possible intermolecular inclusion mode of Flu-β-CD in solution (3D perspecti...

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Published 17 Mar 2016

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Supramolecular structures based on regioisomers of cinnamyl-α-cyclodextrins – new media for capillary separation techniques

Gabor Benkovics,
Ondrej Hodek,
Martina Havlikova,
Zuzana Bosakova,
Pavel Coufal,
Milo Malanga,
Eva Fenyvesi,
Andras Darcsi,
Szabolcs Beni and
Jindrich Jindrich

Beilstein J. Org. Chem. 2016, 12, 97–109, doi:10.3762/bjoc.12.11

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Figure 1: Example of elucidation of 2D NMR spectra of 2-O-Cin-α-CD.

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Figure 2: 2D ROESY spectrum of 2-O-Cin-α-CD in D₂O at 25 °C at 24 mM concentration.

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Figure 3: Expansion of the 2D ROESY spectrum of 2-O-Cin-α-CD indicating the geometric arrangement.

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Figure 4: ¹H NMR spectra of 2-O-Cin-α-CD in D₂O at 25 °C at different concentrations.

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Figure 5: ¹H NMR spectra of 3-O-Cin-α-CD in D₂O at 25 °C recorded at various concentrations.

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Figure 6: Diffusion coefficients of 2-O-Cin-α-CD (black) and, 3-O-Cin-α-CD (red) in D₂O at various concentrat...

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Figure 7: Effect of solvent on the size distribution of aggregates formed by 2-O-Cin-α-CD at 25 °C (the appli...

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Figure 8: Effect of a solvent on the size distribution of aggregates formed by 3-O-Cin-α-CD at 25 °C (the app...

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Figure 9: Aggregate sizes (diameter) of 2-O-Cin-α-CD (black) and 3-O-Cin-α-CD (red) in water at various tempe...

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Figure 10: Schematic representation of the DLS experiment proving the host–guest nature of the aggregate forma...

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Figure 11: The effect of competitive additives on the size distribution of aggregates formed by 3-O-Cin-α-CD a...

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Figure 12: Expansion of the 2D ROESY spectrum of 2-O-Cin-α-CD in the presence of CioOK as competitive guest mo...

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Figure 13: ¹H NMR spectrum of 2-O-Cin-α-CD before (up) and after (down) the addition of CioOK in 5-fold molar ...

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Figure 14: The influence of 5 mM 2-O-Cin-α-CD in BGE (right column) on the decrease of the effective electroph...

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Published 19 Jan 2016

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