Polarization engineering in porous organic polymers for charge separation efficiency and its applications in photocatalytic aerobic oxidations

Facile synthesis of naphthalene-based porous organic salts for photocatalytic oxidative coupling of amines in air

“…S34†). 23,40 Interestingly, the produced gas NH 3 could be timely released from such a solvent-free photocatalytic system rather than accumulated in the catalytic system, which was different from previously reported organic solvent-involved catalytic reaction systems. 21,23,40,41 This interesting result was beneficial to accelerate the photocatalytic reaction based on the chemical equilibrium theory.…”

“…23,40 Interestingly, the produced gas NH 3 could be timely released from such a solvent-free photocatalytic system rather than accumulated in the catalytic system, which was different from previously reported organic solvent-involved catalytic reaction systems. 21,23,40,41 This interesting result was beneficial to accelerate the photocatalytic reaction based on the chemical equilibrium theory. In addition, the specific nano-/microrod morphology with surface defect sites and considerable surface area can increase the sufficient exposure of active sites of NA-POS-1, 14,26,42 which not only favors the diffusion of the reactants and products and enhances the accessibility of the catalytically active sites, but also facilitates the light harvesting ability due to the reflection and scattering of incident light within the photocatalyst NA-POS-1.…”

“…21,22,33 In addition, when tert -butanol ( t -BuOH) was employed as the hydroxyl radical (˙OH) scavenger, the conversion of benzylamine only declined to 94%, indicative of no obvious effect for hydroxyl radicals in this reaction. 21,22,40 When AgNO 3 and KI were used to quench electrons (e − ) and holes (h + ) in the reaction, the conversions significantly dropped to 7% and 20%, confirming the participation of photo-generated e − and h + in photocatalysis. 21–23,33 In particular, the direct evidence for the formation of photo-generated e − was provided by an obvious signal of unpaired electrons in the electron paramagnetic resonance (EPR) spectrum (Fig.…”

Isoreticular Azobenzene Functionalization of Ultrastable Lead Chloride Hybrids for Enhanced Photocatalytic Aerobic Oxidation

“…Meanwhile, TMOF-6 exhibited a 60% retention of intensity after 900 s of irradiation, indicating a weaker ability to generate 1 O 2 (Figures S27 and S28). In addition, nitro blue tetrazolium (NBT) was used to further characterize the generation of •O 2 – and evaluated by the peak intensity at 257 nm in the UV–vis spectra (Figure e). , Compared with TMOF-6, TMOF-6-4azo again demonstrated more efficient NBT degradation upon light irradiation for 54 min, confirming the enhanced ROS generation during photocatalysis (Figures S29 and S30).…”

Carbazole-Based Imine-Linked Covalent Organic Framework for Efficient Heterogeneous Photocatalysis

“…From an environmental perspective, metal-free photocatalysis is a matter of concern. Recently, porous organic polymers (POPs) have been found to be active in heterogeneous photocatalysis. , However, the amorphous or semicrystalline nature of these polymers is responsible for moderate photocatalytic performance, which is due to (i) bulk recombination of photogenerated electrons and holes and (ii) charge trapping at defect sites. In this respect, it remains challenging to fabricate a new class of eco-friendly and cost-effective photocatalysts possessing high crystallinity and stability.…”