Photophysical characterization of 2,3-difunctionalized thieno[3,4-b]pyrazines

In order to better understand the optical properties of polythieno[3,4-b]pyrazine materials, the photophysical characteristics of a series of monomeric 2,3-difunctionalized thieno[3,4-b]pyrazines (where R=H, CH3, C6H13, C8H17, C10H21, C12H25, and Ph) have been studied. Characterization of the room temperature UV–vis and fluorescence spectra, including solvent and pH dependence, are presented and compared to the related species isothianaphthene and quinoxaline.