Homo- and Copolymers Based on Carbon-Bridged Oligo(p-phenylenevinylene)s for Efficient Fluorescence over the Entire Visible Region was written by Nishioka, Hiroki;Tsuji, Hayato;Nakamura, Eiichi. And the article was included in Macromolecules (Washington, DC, United States) in 2018.COA of Formula: C8H4Br2N2 This article mentions the following:
Highly efficient emissive conjugated polymers are desired for optoelectronic applications. While efficient blue to green emissive polymers have been successfully developed, efficient red emission is still challenging, mainly because of the increased nonradiative process rates upon decreasing the energy gap by extension of the π-system. Suppression of this nonradiative decay would be the key for efficient red-emitting polymers. We have previously developed carbon-bridged oligo(p-phenylenevinylene)s (COPVs), which could be promising backbones for efficient light-emitting polymers because of the suppression of rotational disorder by the rigidified coplanar structures. In this work, we report that a series of COPV-based homopolymers and copolymers show fluorescence over a wide range of the visible region (437-667 nm) with high to excellent fluorescence quantum yield: 0.60-0.94 for the blue to green emission and 0.50 for red. The polymers also exhibited high thermal and electrochem. stabilities, which could be promising for future application in optoelectronic devices. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3COA of Formula: C8H4Br2N2).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazine is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. Substituted pyrazines have been found as subunits of multiple synthetically constructed therapeutic agents, as well as several natural products.COA of Formula: C8H4Br2N2