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2 article(s) from Ludwig, Jannis

Synthesis of 4-substituted azopyridine-functionalized Ni(II)-porphyrins as molecular spin switches

Jannis Ludwig,
Tobias Moje,
Fynn Röhricht and
Rainer Herges

Beilstein J. Org. Chem. 2020, 16, 2589–2597, doi:10.3762/bjoc.16.210

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Figure 1: “Record player” approach for molecular spin switching. a) General principle b) Variation of the sub...

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Scheme 1: Synthesis of the nitroso compounds 3 and 6 using the two different methods described by Wegner et a...

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Scheme 2: Synthesis of azopyridines 11, 14, 16 and 18 by nucleophilic aromatic substitution.

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Scheme 3: Synthesis of 3-(3-bromophenylazo)-4-cyanopyridine (20), which was hydrolyzed to yield 3-(3-bromophe...

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Scheme 4: Modular approach for the C–C connection of the Ni(II)-porphyrin 22 and the different 4-substituted ...

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Scheme 5: Cleavage of 1f to yield disulfide 1g [34].

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Figure 2: Hammett plot of the investigated pyridine substituents [36].

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Figure 3: UV–vis spectra of 1e (top), 1h (left) and 1j (right) in acetone water (1:9) (solid line) and after ...

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Published 21 Oct 2020

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Azo-dimethylaminopyridine-functionalized Ni(II)-porphyrin as a photoswitchable nucleophilic catalyst

Jannis Ludwig,
Julian Helberg,
Hendrik Zipse and
Rainer Herges

Beilstein J. Org. Chem. 2020, 16, 2119–2126, doi:10.3762/bjoc.16.179

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Figure 1: Basicity and nucleophilicity switching of the 4-(N,N-dimethylamino)pyridine “record player” molecul...

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Scheme 1: Synthesis of 4-N,N-dimethylamino record player molecule 1 by Suzuki reaction between Ni-porphyrin p...

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Figure 2: Composition of the different states of porphyrin 1 (1 mM) in the PSS at 530 nm and 435 nm, determin...

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Figure 3: a) UV–vis cuvette with a solution of porphyrin 1 (13.1 µM in THF) and the corresponding UV–vis spec...

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Scheme 2: General scheme of the nitroaldol (Henry) reaction that was used to investigate photoswitchable cata...

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Scheme 3: DMAP (2), azopyridine trans-4, record player trans- and cis-1 and Ni-porphyrin 8 were used in kinet...

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Figure 4: Conversion of 4-nitrobenzaldehyde (6) in the Henry reaction with nitroethane (5) as a function of t...

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Published 31 Aug 2020

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