• Energy Research

TEMPO+PF6− substantially accelerates the blue light-initiated aerobic oxidation of benzyl amines into imines over TiO2 microspheres.

The assembly of TiO2 surface with 1-hydroxy-2-naphthoic acid can give rise to an apparent red-shift of its absorption band, and subsequently engender the selective aerobic oxidation of sulfides triggered by visible light.

Here, it is discovered that titanate (H2Ti3O7) nanotubes can confine the merger of erythrosin B (ErB) photocatalysis and TEMPO catalysis for highly selective aerobic oxidation of sulfides under irradiation of green light-emitting diodes (LEDs).

Conjugated polymers like conjugated microporous polymers (CMPs) and covalent organic frameworks (COFs) are burgeoning metal‐free photocatalysts for selective oxidation reactions. They possess outstanding features and salient advantages that are inextricably linked to structures at the molecular level. More effort should be devoted to seeking appropriate linkages which can define their crystallinity as well as photocatalytic activity. Herein, with thiazolo[5,4‐d]thiazole (TzTz) and imine as linkages, TzTz‐TA and TTI‐COF are prepared with triazine as the core, respectively. Conclusively, TTI‐COF shows high crystallinity, whereas TzTz‐TA is amorphous, belonging to CMP. However, TzTz‐TA exhibits better photocatalytic activities than TTI‐COF for the blue light‐driven selective aerobic oxidation of amines. The superior photoelectric properties and a more suitable reduction potential are imposed by the TzTz linkages to override the shortcoming of lack of crystallinity for TzTz‐TA. High selectivities for imines by photocatalytic oxidation of benzyl amines are achieved over TzTz‐TA. In addition, TzTz‐TA emerges with remarkable recoverability and recyclable stability. This study implies that tuning the linkages is essential for boosting the photocatalytic activity of porous materials.

A new photocatalytic protocol utilizing surface complexation of phenol with TiO2 for the selective oxidation of amines into imines in air was presented.

Aerobic oxidation of benzylamine to imine by cooperative photocatalysis of DHNS–Nb2O5and TEMPO is viable.

5(6)-Carboxyfluorescein-sensitized anatase TiO2 photocatalyst with 4-methoxy-2,2,6,6-tetramethylpiperidine1-oxyl as a cocatalyst were selected to undertake the cooperative photocatalytic selective aerobic oxidation of alcohols.

Blue light-powered aerobic oxidation of organic sulfides sufficiently yields sulfoxides over TpTAPT-COF.

BBT-sp2c-COF photocatalysis effectively effectuates selective oxidation of benzyl amines to imines with oxygen under blue light irradiation.