Gao, Baoxiang published the artcileBand gap tunable for near-infrared absorbing chromophores with multi-triphenylamine and tris (thieno)hexaazatriphenylenes acceptors, HPLC of Formula: 52431-30-8, the publication is Tetrahedron Letters (2010), 51(14), 1919-1921, database is CAplus.
Two disk-like D-A type chromophores with multi-triphenylamine donors and hexaazatriphenylene acceptors were synthesized and fully characterized by 1H and 13C NMR, elemental anal. and mass spectrometry. The effects of the hexaazatriphenylene on the optical and electrochem. properties and band gap of the chromophores were investigated. As the hexaazatriphenylene core fused with three thiophene rings, the band gaps of the compounds could be tuned from 1.65 eV to 1.15 eV. The π-π* absorption peak and charge-transfer absorption peak of the hexaazatriphenylene compounds were red shifted from visible spectrum region (393 and 530 nm) to near-IR spectrum region (542 and 756 nm). In addition, due to an increase in the π electronic coupling between electron donor and electron acceptor, the extinction coefficient (charge-transfer absorption) of the hexaazatriphenylene compound decreases 85% from 3.4 × 104 mol-1 dm-3 cm-1 to 0.5 × 104 mol-1 dm-3 cm-1.
Tetrahedron Letters 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, HPLC of Formula: 52431-30-8.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary