Another article by prof. Daniela Gryko in Angewandte Chemie

The article presents a new type of diketopyrrolopyrrole with a π-extended chromophore. The authors developed a two-step synthesis of the title functional dyes by a combination of N-arylation and double intramolecular direct arylation. These pigments strongly emit red light. The publication explains why π-extended diketopyrrolopyrroles, despite having two nitro groups, have a very strong fluorescence. It turned out that the lack of involvement of nitro groups in the S0 → S1 electron transition is the key to the strong emission of aromatic compounds containing NO2 groups. The article was written in cooperation with teams from Germany and France.

The article is available at: https://onlinelibrary.wiley.com/doi/10.1002/anie.202005244