| 초록 |
Chemical conversion of biomass such as lignin has been achieved at the molecular level to understand the mechanism of C-O/C-C bond cleavage, and selective C-C bond cleavage is a valuable technique for various applications such as polymer degradation and biorefineries. However, photocatalytic transformation with direct cleavage of C-C bond remains challenging due to the difficulty in tailoring redox potential of catalyst relevant to the covalent bond decoupling.Here, we investigate the pattern of bond cleavage of β-O-4 or β-1 linkage model of lignin using polyoxometalate as a photocatalyst. Further, we aim to unravel the correlation between the redox potential of photocatalyst and active species on the bond cleavage induced from a charge transfer reaction. Giant Keplerate polyoxometalates are manipulated as a photocatalyst for lignin model decomposition in that their redox potential can be readily tuned by changing metal composition. Especially, Mo132 shows highly selective C-C bond cleavage (selectivity>97.6%) in a homogeneous phase under a water-based environment. Our findings will offer an advanced understanding of selective bond cleavage in other biomass and polymers. |
