《Mechanistic Insights into the Triplet Sensitized Photochromism of Diarylethenes》 was published in Chemistry – A European Journal in 2020. These research results belong to Fredrich, Sebastian; Morack, Tobias; Sliwa, Michel; Hecht, Stefan. Reference of 2,5-Dibromothiophene The article mentions the following:
Operating photoswitchable mols. repetitively and reliably is crucial for most of their applications, in particular in (opto)electronic devices, and related to reversibility and fatigue resistance, which both critically depend on the photoisomerization mechanism defined by the substitution pattern. Two diarylethene photoswitches bearing biacetyl triplet sensitizers either at the periphery or at the core were investigated using both stationary as well as transient UV/Vis absorption spectroscopy ranging from the femtosecond to the microsecond time scale. The diarylethene with two biacetyl moieties at the periphery is switching predominantly from the triplet excited state, giving rise to an enhanced fatigue resistance. In contrast, the diarylethene bearing one diketone at the photoreactive inner carbon atom cyclizes from the singlet excited state and shows significantly higher quantum yields for both cyclization and cycloreversion. In the part of experimental materials, we found many familiar compounds, such as 2,5-Dibromothiophene(cas: 3141-27-3Reference of 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 in the preparation of soluble α,ω-diformyl-a-oligothiophenes.Reference of 2,5-Dibromothiophene
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary