Photophysical property trends for a homologous series of bis-ethynyl-substituted benzochalcogendiazoles

Abstract

We report on the preparation and photophysical property study of three homologous benzoheteroarene–ethynylene systems. Significant differences in the series' optical properties indicate a change in the HOMO–LUMO energy as the chalcogen is altered (O, S and Se) which we have examined using TD-DFT methods and shown to be attributable to modification of the HOMO energy.