《9,10-Di(hydroxymethylphenyl)anthracenes: Highly efficient triplet annihilators with small singlet-triplet energy gap (ΔEST) and planar configuration》 was published in Dyes and Pigments in 2020. These research results belong to Yu, Xue; Fan, Congbin; Dai, Guoliang; Wang, Xiaomei; Ye, Changqing; Tao, Xutang. Recommanded Product: 523-27-3 The article mentions the following:
A series of 9,10-di(hydroxymethylphenyl)anthracene chromophores (named as E-o-DHMPA, Z-o-DHMPA, m-DHMPA and p-DHMPA) are designed to tailor triplet-triplet annihilation upconversion through isomer engineering. It was found that improving mol. planarity makes for mol. π-π interaction, meanwhile, mol. excited singlet energy level (ES1) shows decreasing; however, the triple energy level (ET1) exhibits almost equal. Thus, small singlet-triplet energy gap (ΔEST) of chromophores could be designed. Selective excitation of sensitizer (palladiumIItetrabromophenylporphyrin, PdBrTPP) in solution containing annihilator results in the upconversion (UC) efficiency (ΦUC) increasing from E-o-DHMPA (15.9%), Z-o-DHMPA (18.7%), m-DHMPA (26.0%) to p-DHMPA (26.8%), accompanied by the excitation threshold intensity (Ith, mW·cm-2) decreasing from E-o-DHMPA (292.74), Z-o-DHMPA (174.41), m-DHMPA (36.58) to p-DHMPA (29.78), which are in agreement with the ΔEST decreasing and planarity improving of these isomers. Annihilator with small energy gap (ΔEST) and planar configuration has contribution to triplet-triplet annihilation (TTA), supported by the fact of the Ith value reducing, and thereby increasing UC efficiency (ΦUC), which provides a new strategy for mol. design to develop new triplet annihilator. Finally, the TTA-UC powered photolysis of bilirubin was conducted for the first time, suggesting that TTA-UC can act as an effective light source used in the light therapy for neonatal hyperbilirubinemia. In the part of experimental materials, we found many familiar compounds, such as 9,10-Dibromoanthracene(cas: 523-27-3Recommanded Product: 523-27-3)
9,10-Dibromoanthracene(cas: 523-27-3) is synthesized by the bromination of anthracene. The bromination reaction is carried out at room temperature using carbon tetrachloride as a solvent. Using 80-85% anthracene as raw material, adding bromine to react for half an hour, the yield is 83-88%.Recommanded Product: 523-27-3
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary