Alexander Hofer

Substitution of aromatics by amines at room temperature with negative energy of activation: amino peri-arylenes as metal-free components for dye-sensitized solar cells.

Substitution reactions of the chemically and photochemically unusually stable perylenetetracarboxylic bisimides proceed with neat amines even below room temperature where negative effective energies of activation were found. Analogous reactions proceed with naphthalenecarboximides as the lower homologues and terrylene and quaterrylene carboximides as the higher homologues. Bathochromically absorbing dyes with a novel pattern of substitution were obtained suitable as efficient metal-free light-absorbers for dye-sensitized solar cells.

Controlling UV/vis Absorption and Stokes Shifts in Highly Fluorescent Chromophores by Molecular Dynamics in Targeted Construction of Dyads

Perylenedicarboximides were interlinked in their free peri-position to form dyads where the UV/vis absorptivity was amplified by exciton effects and the strong fluorescence bathochromically shifted by molecular dynamics. Applications of this type of dye with such increased Stokes shifts were discussed.

Axially Chiral Bichromophoric Fluorescent Dyes

A new life for Kurt Mislows authentic amines: Diaminobiphenyls were applied as the framework materials for the synthesis of axially chiral bichromophoric systems with strong CD and CPL effects.

Chromophores Arranged as “Magnetic Meta Atoms”: Building Blocks for Molecular Metamaterials

Benzoperylenetriscarboximides were parallel arranged by stiff spacers where exciton interactions could be controlled by their distance. The most bathochromic electronic transition of the chromophores essentially exhibits only an electric component where an orthogonal magnetic component was established by the distance-controlled interaction of chromophores. Such arrangements were discussed as building blocks for molecular metamaterials.