Importance of Selective Quenching of the Triplet Excited State of Thermally Activated Delayed Fluorescence (TADF) Photosensitizers in Redox-Photosensitized Reactions: Case Studies on Photocatalytic CO₂ Reduction.

ABSTRACT: Redox photosensitizers exhibiting thermally activated delayed fluorescence (TADF) are widely used in the various research fields. We investigated the roles of the singlet and triplet excited states of such molecules in photocatalytic CO₂ reduction. Two TADF compounds (4DPAIPN and 3DPAFIPN) were used in combination with a manganese(I) complex as a catalyst and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole (BIH) and triethanolamine (TEOA) as sacrificial electron donors. In the case of 4DPAIPN, the quantum yield of CO₂ reduction (Φ_CO+HCOO-) was negatively correlated with the concentration of BIH, equaling 43.2% and 20.3% at [BIH] = 5 and 200 mM, respectively. The reduction of the singlet excited state by BIH afforded

SUBMITTER: Tamaki Y 

PROVIDER: S-EPMC12426915 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature