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2 article(s) from Yordanova, Stanislava B

Precious metal-free molecular machines for solar thermal energy storage

Meglena I. Kandinska,
Snejana M. Kitova,
Vladimira S. Videva,
Stanimir S. Stoyanov,
Stanislava B. Yordanova,
Stanislav B. Baluschev,
Silvia E. Angelova and
Aleksey A. Vasilev

Beilstein J. Org. Chem. 2019, 15, 1096–1106, doi:10.3762/bjoc.15.106

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Scheme 1: Quaternization of 2-methylbenzothiazoles with alkane sultones.

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Scheme 2: Synthesis of 4-(aza-15-crown-5)benzocarbaldehyde (3) [22].

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Scheme 3: Synthesis of dyes 4a–d.

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Figure 1: a–c) Dependence of the absorption spectra of the dyes 4b, 4c and 4d, respectively (c_L = 1.0 × 10⁻⁵ ...

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Figure 2: Dependence of the fluorescence of 4b on the concentration of the Ba²⁺ ions. Excitation wavelength λ...

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Figure 3: a) Dependence of absorption spectra of dye 4b (c_L = 1.0 × 10⁻⁴ M) with Ba²⁺ (c_M = 1 M) on the irrad...

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Figure 4: UV–vis absorption spectra of dye 4b (1.0 × 10⁻⁴ M) free and in complex with Ba²⁺ (1 M) before and a...

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Figure 5: Optimized structures of the cis and trans isomers of dyes 4a–d.

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Figure 6: Optimized structures of the Ba²⁺-complexes of cis and trans isomer of 4b.

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Figure 7: Simulated spectra with spectral lifetime broadening TDPBE0 spectra in ACN for dye 4b and its Ba²⁺ c...

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Published 14 May 2019

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Halogen-containing thiazole orange analogues – new fluorogenic DNA stains

Aleksey A. Vasilev,
Meglena I. Kandinska,
Stanimir S. Stoyanov,
Stanislava B. Yordanova,
David Sucunza,
Juan J. Vaquero,
Obis D. Castaño,
Stanislav Baluschev and
Silvia E. Angelova

Beilstein J. Org. Chem. 2017, 13, 2902–2914, doi:10.3762/bjoc.13.283

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Scheme 1: Chemical structures of TO and SYBR Green I – commercial monomethine fluorescent dsDNA binders.

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Scheme 2: Synthesis of the monofluoro-substituted dye TO-1F. Reagents, conditions and yields: (i) sodium meth...

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Scheme 3: Synthesis of new halogen-containing analogues of TO. Reagents, conditions and yields: (i) DMS, 100 ...

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Figure 1: Absorption spectra of the studied compounds in MeOH (c = 1 × 10⁻⁵ M).

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Figure 2: Absorption spectra of dye 5b (c = 5 × 10⁻⁷ M) in TE buffer, in the absence and presence of dsDNA (c...

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Figure 3: Fluorescence spectra of dye 5a (c = 5 × 10^–7 M) in TE buffer and in the presence of increasing conc...

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Figure 4: Photostability of dyes TO-7Cl and 5a–d in acetonitrile in the concentration range of 1 × 10⁻⁵ M.

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Figure 5: B3LYP optimized structures.

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Figure 6: Graphical representation of the frontier orbitals (isodensity plot, isovalue = 0.02 a.u.).

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Figure 7: Simulated TDPBE0 spectra in methanol.

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Figure 8: Electron density (isovalue = 0.002) mapped with electrostatic potential (color scheme: green for ne...

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Published 28 Dec 2017

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