Twisted olefinic building blocks for low bandgap polymers in solar cells and ambipolar field-effect transistors was written by Chiu, Chien-Yang;Wang, Hengbin;Phan, Hung;Shiratori, Kazuya;Nguyen, Thuc-Quyen;Hawker, Craig J.. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 2016.SDS of cas: 653-92-9 This article mentions the following:
A series of polymers based on 8,8′-biindeno[2,1-b]thiophenylidene for use in photovoltaic devices and field-effect transistors are reported. These structurally twisted olefins are effective building blocks for preparation of low bandgap polymers with optical bandgaps of 1.2-1.5 eV. Device performance, such as Voc and Jsc, in solar cell devices could be successfully modulated by incorporation of a variety of comonomers. Ambipolar properties in field-effect transistors using Au electrodes were also studied, with PtBTPDPP exhibiting balanced charge transport properties with hole and electron mobilities of 0.09 and 0.12 cm2·V-1·s-1, resp. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015. In the experiment, the researchers used many compounds, for example, Methyl 2-bromo-4-fluorobenzoate (cas: 653-92-9SDS of cas: 653-92-9).
Methyl 2-bromo-4-fluorobenzoate (cas: 653-92-9) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbonbromine bond is electrophilic in nature. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.SDS of cas: 653-92-9
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary