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1 article(s) from Kölsch, Sarah

Reversible photoswitching of the DNA-binding properties of styrylquinolizinium derivatives through photochromic [2 + 2] cycloaddition and cycloreversion

Sarah Kölsch,
Heiko Ihmels,
Jochen Mattay,
Norbert Sewald and
Brian O. Patrick

Beilstein J. Org. Chem. 2020, 16, 111–124, doi:10.3762/bjoc.16.13

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Graphical Abstract

Scheme 1: Synthesis of styrylquinolizinium derivatives 3a–d.

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Figure 1: Absorption spectra and normalized emission spectrum (Abs. = 0.10, 3b: λ_ex = 394 nm) of derivatives ...

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Figure 2: Spectrophotometric titration upon the addition of ct DNA to the styrylquinolizinium derivatives 3a ...

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Figure 3: Spectrofluorimetric titration upon the addition of ct DNA to the styrylquinolizinium derivatives 3a...

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Figure 4: CD and LD spectra of the styryl derivatives 3a (A), 3b (B), 3c (C), and 3d (D) with ct DNA in BPE b...

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Figure 5: Spectrophotometric monitoring of the irradiation of styrylquinolizinium derivatives 3a (A), 3b (B), ...

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Figure 6: Absorption of the monomers (c = 20 µM, red) 3b (A) and 3c (B) and their dimers (black) 4b and 4c in...

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Figure 7: Photometric monitoring of the photoreaction of 3b (c = 20 µM) to the dimer 4b by irradiation at ca....

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Figure 8: ORTEP drawings of cyclobutane derivatives 4b (A) and 4c (B) in the solid state (thermal ellipsoids ...

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Scheme 2: Possible pathways for the selective photodimerization of styrylquinolizinium derivatives 3b and 3c.

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Figure 9: A) Spectrophotometric titration of ct DNA to dimer 4b in BPE buffer (c_L = 20 µM, c_{ct DNA} = 1.45 mM, ...

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Figure 10: A) Photometric and B) CD spectroscopic monitoring of the photoinduced switching (4b: λ_ex = 315 nm, ...

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Scheme 3: Photoinduced switching of the DNA binding properties of styrylquinolizinium compound 3b.

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Published 23 Jan 2020

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