N,N-Diaryl Dihydrophenazines as Photoredox Catalysts for PET-RAFT and Sequential PET-RAFT/O-ATRP.
N,N-Diaryl Dihydrophenazines as Photoredox Catalysts for PET-RAFT and Sequential PET-RAFT/O-ATRP.
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DOI：
10.1021/acsmacrolett.8b00281
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发表时间：
2018-05
影响因子：
5.8
通讯作者：
Jordan C Theriot;G. Miyake;C. Boyer
中科院分区：
文献类型：
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作者：
Jordan C Theriot;G. Miyake;C. Boyer
N，N-二芳基二氢吩嗪作为有机光氧化还原催化剂用于光诱导电子/能量转移-可逆加成-断裂链转移（PET-RAFT）聚合。这些PC介导PET-RAFT的能力在很大程度上取决于PC进入光激发分子内电荷转移状态的能力。在激发态下显示分子内电荷转移的PC的使用允许各种单体（包括乙酸乙烯酯）和在宽范围的溶剂中的有效PET-RAFT。利用这些PC也介导有机催化原子转移自由基聚合（O-ATRP）的能力，使用相同的PC进行PMA-b-PMMA的连续PET-RAFT/O-ATRP嵌段共聚用于两种聚合。
N,N-Diaryl dihydrophenazines are employed as organic photoredox catalysts (PCs) for photoinduced electron/energy transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization. The ability of these PCs to mediate PET-RAFT is heavily dependent on the ability of the PC to access a photoexcited intramolecular charge transfer state. The use of PCs displaying intramolecular charge transfer in the excited state allows for efficient PET-RAFT of a variety of monomers, including vinyl acetate, and in a wide range of solvents. The ability of these PCs to also mediate organocatalyzed atom transfer radical polymerization (O-ATRP) is exploited to perform a sequential PET-RAFT/O-ATRP block copolymerization of PMA-b-PMMA using the same PC for both polymerizations.