Band-gap engineering of donor-acceptor-substituted π-conjugated polymers was written by Van Mullekom, H. A. M.;Vekemans, J. A. J. M.;Meijer, E. W.. And the article was included in Chemistry – A European Journal in 1998.Recommanded Product: 5,8-Dibromoquinoxaline This article mentions the following:
Three series of alternating donor-acceptor-substituted co-oligomers (with different chain lengths) have been prepared by application of the Pd-catalyzed Stille coupling methodol. They contain pyrrole or thiophene as the electron-rich unit and quinoxaline or 2,1,3-benzothiadiazole as the electron-deficient unit. The trimethylstannyl group is always located on the electron-rich unit, whereas the bromo substituent is always located on the electron-deficient one. The tBoc-protecting group is used in the synthesis of the pyrrole-containing oligomers. The incremental bathochromic shift of λmax upon chain elongation of the three series of oligomers is less than that of the homo-oligomers of thiophene and pyrrole; this decrease is caused by a diminished dispersion of the LUMO level upon chain elongation. This conclusion was drawn after comparing the oxidation and reduction behavior of the thiophene/benzothiadiazole co-oligomers with that of thiophene oligomers. The incremental bathochromic shift is similar for all three series of oligomers and is used as a tool in the band-gap engineering of donor-acceptor-substituted π-conjugated polymers. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3Recommanded Product: 5,8-Dibromoquinoxaline).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazine derivatives have antitumor, antibiotic, anticonvulsant, antituberculous and diuretic effects as well as kinase, enzymatic and potent tubulin and FtsZ polymerization inhibitory activities. 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.Recommanded Product: 5,8-Dibromoquinoxaline