Lignin C-C bond cleavage induced by consecutive two-photon excitation of a metal-free photocatalyst.
Pengju LiRong LiuZijian ZhaoFushuang NiuKe HuPublished in: Chemical communications (Cambridge, England) (2023)
Photocatalytic lignin valorization has caught widespread attention; yet the reaction systems often employ noble metal complexes, hydrogen atom transfer (HAT) agents, and/or sacrificial electron donors/acceptors that do not comply with atom economy or environmental friendliness. Herein, we discovered that N -phenylphenothiazine (PTH) as a metal-free photocatalyst induced the cleavage of the lignin C α -C β bond under ambient conditions free of those additional agents with a high yield and selectivity toward benzoic acid. Transient spectroscopic investigations revealed that the energy-demanding C α -C β bond cleavage was induced by the potent oxidant, 2 PTH˙ + *, that was derived from consecutive two-photon excitation of PTH.
Keyphrases
- electron transfer
- visible light
- ionic liquid
- dna binding
- highly efficient
- living cells
- air pollution
- molecular dynamics
- high glucose
- energy transfer
- molecular docking
- anti inflammatory
- working memory
- particulate matter
- diabetic rats
- transcription factor
- single cell
- endothelial cells
- transition metal
- gold nanoparticles
- monte carlo
- climate change
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- reduced graphene oxide
- kidney transplantation