Yuan, Yuehua; Zhou, Wenfa; Tian, Maozhong; Song, Jiangtao; Bai, Yunfeng; Feng, Feng; Song, Yinglin published an article in 2021. The article was titled 《Synthesis, characterization and third-order nonlinear optical behaviour of three novel ethyne-linked donor/acceptor chromophores》, and you may find the article in Dyes and Pigments.Name: 2,5-Dibromothiophene The information in the text is summarized as follows:
Three novel ethyne-linked donor/acceptor chromophores, BAB, BAS and SAS were synthesized. The results of BAB in femtosecond and nanosecond Z-scan at 532 nm reveal that the transition from saturable absorption (SA) to reverse saturable absorption (RSA), while that of BAS and SAS display RSA. The femtosecond Z-scan results for all compounds at 600 nm-800 nm indicate the obvious RSA, which can be mainly attributed to the two-photon absorption (TPA). The TA results demonstrate that all compounds display strong excited-state absorption and long lifetime, and the evolution of TA spectra for these compounds reveals the relaxation process from the local excited-state (LE) to charge transfer state (CTS). With different conjugation extent and intramol. charge transfer (ICT), the nonlinear response and excited-state dynamics of these chromophores could be dramatically modulated. The threshold of BAS/DCM solution excited at 532 nm with nanosecond pulse was 0.631 J/cm2. These compounds may be the potential candidates for future application in optical limiting. In the experiment, the researchers used 2,5-Dibromothiophene(cas: 3141-27-3Name: 2,5-Dibromothiophene)
2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene may be used as starting reagent for the synthesis of α,α′-didecylquater-, -quinque- and -sexi-thiophenes.Name: 2,5-Dibromothiophene
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary