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3 article(s) from Dzubiel, Darinka

Synthesis of 9-arylalkynyl- and 9-aryl-substituted benzo[b]quinolizinium derivatives by Palladium-mediated cross-coupling reactions

Siva Sankar Murthy Bandaru,
Darinka Dzubiel,
Heiko Ihmels,
Mohebodin Karbasiyoun,
Mohamed M. A. Mahmoud and
Carola Schulzke

Beilstein J. Org. Chem. 2018, 14, 1871–1884, doi:10.3762/bjoc.14.161

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Figure 1: Structures of 9-substituted benzo[b]quinolizinium derivatives 1 and 2.

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Scheme 1: Synthesis of benzo[b]quinolizinium-9-trifluoroborate (3b) and 9-arylbenzo[b]quinolizinium derivativ...

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Scheme 2: Synthesis of 9-(arylethynyl)benzo[b]quinolizinium derivatives 2a–d.

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Figure 2: Molecular structures of derivatives 2a (top) and 2b (bottom) in the solid state. Ellipsoids are sho...

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Figure 3: Absorption spectra of derivatives 2a (A), 2b (B), 2c (C) and, 2d (D); c = 20 μM; solvents: H₂O (mag...

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Figure 4: Emission spectra of derivatives 2a (A), 2c (B) and 2d (C); c = 20 μM; λ_ex = 375 nm; solvents: H₂O (...

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Figure 5: Photometric (A) and fluorimetric (B) acid-base titration of 2c; c = 20 μM in Britton–Robinson buffe...

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Figure 6: Photometric titration of 2a (A), 2b (B), 2c (C), and 2d (D) with ct DNA in BPE buffer (16 mM Na⁺; 5...

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Figure 7: Photometric titration of 2a (A), 2b (B), 2c (C) and 2d (D) with 22AG in potassium phosphate buffer ...

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Figure 8: Fluorimetric titration of 2a (A), 2b (B) and 2d (C) with ct DNA in potassium phosphate buffer (95 m...

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Figure 9: Fluorimetric titration of 2a (A) and 2d (B) with 22AG in potassium phosphate buffer (95 mM K⁺; 5% D...

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Scheme 3: Photoinduced charge transfer upon the excitation of derivative 2d.

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Published 23 Jul 2018

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Interactions between photoacidic 3-hydroxynaphtho[1,2-b]quinolizinium and cucurbit[7]uril: Influence on acidity in the ground and excited state

Jonas Becher,
Daria V. Berdnikova,
Darinka Dzubiel,
Heiko Ihmels and
Phil M. Pithan

Beilstein J. Org. Chem. 2017, 13, 203–212, doi:10.3762/bjoc.13.23

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Figure 1: Structures of quinolizinium derivatives 1a–c and 2.

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Scheme 1: Synthesis of 3-hydroxynaphtho[1,2-b]quinolizinium bromide (2).

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Figure 2: Absorption (A, c = 100 µM) and normalized emission spectra (B, c = 10 µM or Abs. = 0.1 at λ_ex) of d...

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Figure 3: Photometric (A) and fluorimetric (B) acid–base titration (λ_ex = 380 nm) of naphthoquinolizinium 2 (c...

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Figure 4: Absorption spectra of 2 (c = 100 µM) in MeOH (A) and MeCN (B). Black lines: without additive, red: ...

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Figure 5: Normalized emission spectra of 2 (c = 10 µM) in MeOH (A, λ_ex = 400 nm) and MeCN (B, λ_ex = 398 nm). ...

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Figure 6: Photometric titration of CB[7] (c = 0.45 mM) to 2 (c = 15 µM) in BPE buffer (with 10% v/v DMSO) at ...

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Figure 7: Photometric (A) and fluorimetric (B) acid–base titration (λ_ex = 380 nm) of 2 (c = 15 µM) in the pre...

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Scheme 2: Acid–base equilibrium of hydroxynaphthoquinolizinium 2.

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Figure 8: Structures of quinolizinium derivatives 6–8.

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Published 01 Feb 2017

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A comparative study of the interactions of cationic hetarenes with quadruplex-DNA forming oligonucleotide sequences of the insulin-linked polymorphic region (ILPR)

Darinka Dzubiel,
Heiko Ihmels,
Mohamed M. A. Mahmoud and
Laura Thomas

Beilstein J. Org. Chem. 2014, 10, 2963–2974, doi:10.3762/bjoc.10.314

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Scheme 1: Equilibrium between single-stranded ILPR-DNA a2 and its parallel and antiparallel quadruplex form.

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Figure 1: Structures of ligands 1–6 used in this study.

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Figure 2: A) CD spectra of ILPR-DNA a2 (20 μM) at different temperatures in potassium phosphate buffer (95 mM...

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Figure 3: CD spectra of ILPR-sequence a2 (20 µM) in potassium phosphate buffer (95 mM, pH 7.0; ^__ : immediate...

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Figure 4: Fluorimetric monitoring of thermal DNA-denaturation of the ILPR quadruplex Fa2T (0.2 μM DNA concent...

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Figure 5: Fluorimetric titration of 1a (A), 1b (B), 1c (C), 1d (D) and 1e (E) with a2 in potassium phosphate ...

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Figure 6: Fluorimetric titration of 2 (A), 3 (B), 4 (C), 5 (D) and 6 (E) with a2 in potassium phosphate buffe...

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Figure 7: Job plot from fluorimetric analysis of mixtures of ligands 1e (A), 4 (B) and 6 (C) with ILPR-DNA a2...

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Figure 8: CD spectra of ILPR-DNA a2 in the presence of 1d (A), 1e (B), 2 (C), 4 (D), 5 (E) and 6 (F) at LDR =...

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Published 11 Dec 2014

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