Electronic structure of small band gap oligomers based on cyclopentadithiophenes and acceptor units was written by Karsten, Bram P.;Bijleveld, Johannes C.;Viani, Lucas;Cornil, Jerome;Gierschner, Johannes;Janssen, Rene A. J.. And the article was included in Journal of Materials Chemistry in 2009.Related Products of 148231-12-3 This article mentions the following:
A combined exptl. and theor. study was carried out on a series of well-defined small band gap oligomers. The cyclopentadithiophene oligomers were prepared by Suzuki coupling of thiopheneboronic esters and dibromophenylquinoxaline compounds These oligomers comprise two terminal electron-rich cyclopentadithiophene units connected to six different electron deficient aromatic rings that allow tuning the optical band gap from 1.4 to 2.0 eV. The optical absorption of the ground state, triplet excited state, and radical cation was studied. The optical band gap correlates with the electrochem. oxidation and reduction potential and is further supported by quantum-chem. calculations at the d. functional theory (DFT) level. The optical absorption of the radical cations shows only little variations among the different oligomers, suggesting that the charge is mainly localized on the donor moieties. Triplet energy levels are generally low (<1.2 eV) and the singlet-triplet splitting remains significant when going to smaller band gaps. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3Related Products of 148231-12-3).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazines are volatile compounds that are used in the cosmetic, food, flavor, and fragrance industries. 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.Related Products of 148231-12-3