Multicolor Self-Assembled Fluorene Co-Oligomers: From Molecules to the Solid State via White-Light-Emitting Organogels was written by Abbel, Robert;van der Weegen, Rob;Pisula, Wojciech;Surin, Mathieu;Leclere, Philippe;Lazzaroni, Roberto;Meijer, E. W.;Schenning, Albertus P. H. J.. And the article was included in Chemistry – A European Journal in 2009.Synthetic Route of C8H4Br2N2 This article mentions the following:
Five fluorene-based co-oligomers were prepared and the self-assembly was studied in a wide range of concentrations, from dilute solutions to the solid state. Subtle changes to the chem. structure, introduced to tune the emission colors over the entire visible range, induce strong differences in aggregation. Only two of the fluorescent co-oligomer derivatives self-assemble to form soluble fibrils from which fluorescent organogels emerge at higher concentrations In contrast, the other compounds form precipitates Mixed fluorescent co-oligomer systems exhibit partial energy transfer, which allows the creation of white-light-emitting gels. A mechanism for the hierarchical self-assembly of the fluorene oligomers is proposed based on exptl. results and mol. modeling calculations In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3Synthetic Route of C8H4Br2N2).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazine heterocycles and their benzo derivatives possess many interesting properties, including chemical reactivity profiles, and have diverse applications in total synthesis, medicine, chemical biology, materials, dyes, and imaging. Pyrazines undergo nearly all of the same reactions as pyrimidines, from nucleophilic substitution (SNAr) to palladium-catalyzed cross coupling reactions.Synthetic Route of C8H4Br2N2