Polythiophenes with unusual electrical and optical properties based on donor acceptor alternance strategy was written by Gallazzi, Maria C.;Toscano, Francesca;Paganuzzi, Daniela;Bertarelli, Chiara;Farina, Alessandra;Zotti, Gianni. And the article was included in Macromolecular Chemistry and Physics in 2001.Safety of 5-Bromothiophene-3-carbaldehyde This article mentions the following:
The strategy of donor-acceptor alternation was adopted to reduce the energy gap in substituted polythiophenes; energy gaps down to 1.2 eV were obtained, which is a very low value in the class of polythiophenes. Alkoxy groups and dicyanoethenyl groups were used to prepare electron-rich and electron-poor thiophene units. The copolymers were obtained by coupling reaction methods (Suzuki) and by oxidative chem. and electrochem. polymerization of an opportunely designed substituted terthiophene. X-ray studies and spectroscopic data on the copolymers evidenced that the dicyanoethenyl group as substituent was rather steric demanding and susceptible of side reactions also preventing the n-doping of the material. The conductivity behavior was unusual but compatible with localized charge carriers. In the experiment, the researchers used many compounds, for example, 5-Bromothiophene-3-carbaldehyde (cas: 18791-79-2Safety of 5-Bromothiophene-3-carbaldehyde).
5-Bromothiophene-3-carbaldehyde (cas: 18791-79-2) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.Safety of 5-Bromothiophene-3-carbaldehyde
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary