McNamara, Louis E. published the artcileDonor-Acceptor-Donor Thienopyrazines via Pd-Catalyzed C-H Activation as NIR Fluorescent Materials, COA of Formula: C4Br2N2O4S, the publication is Journal of Organic Chemistry (2016), 81(1), 32-42, database is CAplus and MEDLINE.
A series of thienopyrazine-based donor-acceptor-donor (D-A-D) near-IR (NIR) fluorescent compounds II were synthesized from I through a rapid, palladium-catalyzed C-H activation route. The dyes were studied through computational anal., electrochem. properties anal., and characterization of their photophys. properties. Large Stokes shifts of approx. 175 nm were observed, which led to near-IR emission. Computational evaluation shows that the origin of this large Stokes shift is a significant mol. reorganization particularly about the D-A bond. The series exhibits quantum yields of up to φ = >4%, with emission maxima ranging from 725 to 820 nm. The emission is strong in solution, in thin films, and also in isolation at the single-mol. level. Their stable emission at the single-mol. level makes these compounds good candidates for single-mol. photon sources in the near-IR.
Journal of Organic Chemistry published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, COA of Formula: C4Br2N2O4S.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary