Easily-soluble heteroacene bis(benzothieno)silole derivatives for sensing of nitro explosives was written by Zhao, Yunfang;Hao, Wanglong;Ma, Wangjing;Zang, Zhanzhan;Zhang, Huarong;Liu, Xiaoxia;Zou, Sufen;Zhang, Haixia;Liu, Weichao;Gao, Jianhua. And the article was included in New Journal of Chemistry in 2014.Electric Literature of C8H4Br2S This article mentions the following:
Three new heteropentacene derivatives I (4–6; R1 = R2 = Me; R1 = R2 = C6H13; R1 = Me, R2 = H) based on bis(benzothieno)silole were synthesized. The XRD characterization reveals that the crystal structures of the heteropentacenes can be significantly influenced by the Me substitution. The optical and electrochem. properties were investigated and the exptl. results confirm that the silole motif lowers the LUMO level of the heteropentacenes. Preliminary results show that the insertion of silole ring systems into rigid heteropentacenes leads to an improved solubility and high fluorescence quantum yield up to 0.74 in solution, which indicates the potential of these new silole-containing compounds for photonic and photoelec. applications. The strong and sensitive fluorescence quenching behavior towards picric acid (PA) demonstrates that the silole-containing heteropentacene derivatives are also promising fluorescent sensor materials for detecting the nitro-containing explosives. In the experiment, the researchers used many compounds, for example, 2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7Electric Literature of C8H4Br2S).
2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The electrophilic substitution of benzothiophene systems is much less regioselective than that of indoles. Its aromaticity makes it relatively stable, although as a heterocycle, it has reactive sites which allow for functionalization.Electric Literature of C8H4Br2S
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem