Photoinduced Biomimetic Room-Temperature C-O Bond Cleavage over Mn Doped CdS.

Abstract

Selective C-O bond cleavage is an efficient way for the biomass valorization to value-added chemicals, but is challenged to be operated at room temperature via conventional thermal catalysis. Herein, inspired from the DNA biosynthesis which involves a radical-mediated spin-center shift (SCS) C-O bond cleavage process, we report a biomimetic room-temperature C-O bond cleavage of vicinal diol (HOCHCH-OH). We construct a Mn doped CdS (Mn/CdS) as a photocatalyst to mimic the biologic SCS process. The Mn site plays pivotal role: (1) accelerates the photo-induced carrier separation, promoting the hole-mediated C-H bond cleavage to generate carbon-centered radicals, and (2) serves as the binding site for -OH groups, making it to be an easier leaving group. Mn/CdS achieves 0.28 mmol gcat -1  h-1 of hydroxyacetone (HA) from glycerol dehydration at room temperature under visible light irradiation, which is 3.5-fold that over pristine CdS and 40-fold that over bulk MnS/CdS. This study provides a new biomimetic room-temperature C-O bond cleavage process, which is promising for the biomass valorization.

• Authors: Wenjing Zou, Hongru Zhou, Min Wang
• Journal: ChemSusChem (ChemSusChem) Vol. 16 Issue 20 Pg. e202300727 (Oct 20 2023) ISSN: 1864-564X [Electronic] Germany
• PMID: 37486587 (Publication Type: Journal Article)
• Copyright: © 2023 Wiley-VCH GmbH.