Abstract
We report a facile approach to fine tune the redox potentials of π-conjugated porous organic frameworks (POFs) by copolymerizing carbazolic electron donor (D) and electron acceptor (A) based comonomers at different ratios. The resulting carbazolic copolymers (CzCPs) exhibit a wide range of redox potentials that are comparable to common transition-metal complexes and are used in the stepwise photocatalytic degradation of lignin β-O-4 models. With the strongest oxidative capability, CzCP100 (D:A = 0:100) exhibits the highest efficiency for the oxidation of benzylic β-O-4 alcohols, while the highly reductive CzCP33 (D:A = 66:33) gives the highest yield for the reductive cleavage of β-O-4 ketones. CzCPs also exhibit excellent stability and recyclability and represent a class of promising heterogeneous photocatalysts for the production of fine chemicals from sustainable lignocellulosic biomass.
Original language | English (US) |
---|---|
Pages (from-to) | 5062-5070 |
Number of pages | 9 |
Journal | ACS Catalysis |
Volume | 7 |
Issue number | 8 |
DOIs | |
State | Published - Aug 4 2017 |
Keywords
- carbazole
- heterogeneous catalysis
- lignin degradation
- porous organic frameworks
- visible photocatalysis
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)