A novel photochromic diarylethene based on pyrazole and benzothiophene moieties for optical recording was written by Liu, Hongliang;Pu, Shouzhi;Cui, Shiqiang;Liu, Weijun. And the article was included in Advanced Materials Research (Durnten-Zurich, Switzerland) in 2011.Quality Control of 3-Bromo-2-methylbenzo[b]thiophene This article mentions the following:
A novel photochromic diarylethene I containing pyrazole moiety was synthesized and its photochromic and fluorescent properties were also investigated. The compound exhibited remarkable photochromism, changing from colorless to purple after irradiation with UV light both in solution and in PMMA film. In hexane solution and in PMMA film, the open-ring isomer I exhibited relatively remarkable fluorescence. The results indicated that the pyrazole moiety played a very important role during the process of photochromic reaction for the diarylethene derivative Using closed-form of I optical storage was performed successfully. In the experiment, the researchers used many compounds, for example, 3-Bromo-2-methylbenzo[b]thiophene (cas: 10243-15-9Quality Control of 3-Bromo-2-methylbenzo[b]thiophene).
3-Bromo-2-methylbenzo[b]thiophene (cas: 10243-15-9) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The electrophilic substitution of benzothiophene systems is much less regioselective than that of indoles. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.Quality Control of 3-Bromo-2-methylbenzo[b]thiophene
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem