9,9-Dimethyl Dihydroacridine-Based Organic Photocatalyst for Atom Transfer Radical Polymerization from Modifying “Unstable” Electron Donor was written by Liu, Yiming;Chen, Qi;Tong, Yujie;Ma, Yuguo. And the article was included in Macromolecules (Washington, DC, United States) in 2020.Product Details of 162258-89-1 This article mentions the following:
Organic photocatalytic atom transfer radical polymerization (ATRP) has recently become a research highlight. Organic photocatalysts based on phenothiazine, phenoxazine and phenazine were reported and exhibited remarkable performance. All those structures contain two heteroatoms, which makes the oxidative state (i.e., the radical cation) of the photocatalysts stable enough to complete the catalytic cycle. However, despite for the similar structure, 9,9-di-Me dihydroacridine (DHA) was rarely used for constructing photocatalyst due to its unstable oxidative state. DHA is a weak electron donor that was widely applied in blue emitting thermally activated delayed fluorescence (TADF) mols. Its weaker electron donating ability will contribute to higher energy level of excited state. And also, the higher oxidation potential of its radical cation will contribute to better controllability due to fast reversible dormancy. In this study, we found that substitution on the active sites of DHA could make it stable enough to be the donor part of donor-acceptor (D-A) type photocatalyst for ATRP. Moreover, chem. modification is necessary for both stabilizing radical cation and improving the controllability in polymerization process. Further modification was made to construct rapid equilibrium between initiation and reversible dormancy, and polymerization with quant. initiator efficiencies was achieved with a polydispersity of 1.14. It is notable that such modification can probably apply to different kinds of electron donors, and various organic chromophores could thus be applied to construct organic photocatalyst with superior performance. In the experiment, the researchers used many compounds, for example, 4-Bromo-4′-tert-butylbiphenyl (cas: 162258-89-1Product Details of 162258-89-1).
4-Bromo-4′-tert-butylbiphenyl (cas: 162258-89-1) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.Product Details of 162258-89-1
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary