Efficient self-contained photoacid generator system based on photochromic terarylenes was written by Li, Ruiji;Nakashima, Takuya;Kanazawa, Rui;Galangau, Olivier;Kawai, Tsuyoshi. And the article was included in Chemistry – A European Journal in 2016.Name: 2,3-Dibromobenzo[b]thiophene This article mentions the following:
A series of highly sensitive neutral photoacid generators (PAGs) based on photochromic terarylenes was prepared Like the example presented herein, these compounds show a subsequent thermal elimination of a Bronsted acid after a light-triggered 6π-electrocyclization, concomitant with the hexatriene aromatization. A novel type of mol. systems was developed, in which one thiazolyl moiety was replaced by a thienyl group. Depending on the solvents and on the nature of the acid source, the quantum yield (QY) for acid generation could reach up to 0.6. Comparative studies on the acid source clearly showed that aromatic leaving groups tend to extinguish the mol. system photoefficiency. A second type was also prepared, in which the nature of the hetero-aromatic rings were identical to our previous example, but their sequence was modified. Therefore, a second level of improvement was achieved in nonpolar solvents, pushing the QY value up to 0.7. Finally, we demonstrated the mesylic acid-releasing PAG as a photocatalyst in a chem. amplified pos. resist system. In the experiment, the researchers used many compounds, for example, 2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7Name: 2,3-Dibromobenzo[b]thiophene).
2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7) belongs to benzothiophene derivatives. Benzothiophene is used as starting material for the synthesis of bioactive molecules. The core structure is a part of various pharmaceutical substances and natural products. Its aromaticity makes it relatively stable, although as a heterocycle, it has reactive sites which allow for functionalization.Name: 2,3-Dibromobenzo[b]thiophene
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem