A series of novel soluble nature-inspired flavin derivatives substituted with short butyl and bulky ethyl-adamantyl alkyl groups was prepared via simple and straightforward synthetic approach with moderate to good yields. The comprehensive characterization of the materials, to assess their application potential, has demonstrated that the modification of the conjugated flavin core enables delicate tuning of the absorption and emission properties, optical bandgap, frontier molecular orbital energies, melting points, and thermal stability. Moreover, the thin films prepared thereof exhibit smooth and homogeneous morphology with generally high stability over time.

Linz Institute for Organic Solar Cells Physical Chemistry Johannes Kepler University Linz Altenbergerstraße 69 4040 Linz Austria

Materials Research Centre Faculty of Chemistry Brno University of Technology Purkyňova 118 612 00 Brno Czech Republic

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