- Merging polyacenes and cationic helicenes: from weak to intense chiroptical properties in the far red region
Romain Duwald, Johann Bosson, Simon Pascal, Stéphane Grass, Francesco Zinna, Céline Besnard, Lorenzo Di Bari, Denis Jacquemin, Jérôme Lacour
Chem. Sci. 2020, 11, 1165-1169
A series of helical tetracenes and pentacenes was synthesized from cationic  and helicene precursors. These colorful acenes fluoresce in the far red region. While helicene-based pentacenes exhibit chiroptical properties mainly in the UV region, helicene-derived tetracenes show enhanced ECD in the visible range, in addition to clear CPL responses. This difference is rationalized using first principles.
open archive unige:129838