Novel monatomic metal photocatalyst and preparation method and application thereof in carbon-oxygen cross-coupling reaction
A photocatalyst and metal light technology, which is applied in the research and development of new single-atom metal photocatalysts, can solve the problems of metal deposition deactivation, limited electron or energy transfer efficiency in the initiation step, poor recycling rate, etc., and achieve recycling , improve atomic efficiency, and avoid the effect of deposition deactivation
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Embodiment 1
[0044] 10g of urea was heated to 500°C at a heating rate of 2°C / min, and kept at 500°C in air for 2 hours. The obtained yellow solid product was triturated and washed with water and ethanol. The sample was vacuum dried for 12 h to obtain C 3 N 4 . By adding 1mmol / L nickel chloride hexahydrate, C 3 N 4 (2g / L) was dispersed in a suspension of 50mL DMAc and reacted for 6 hours. It was then centrifuged, and the solid product was washed twice, then dried under vacuum for 12 h. get C 3 N 4 Loaded mononuclear nickel.
Embodiment 2
[0046] 10mg C 3 N 4 -Ni and 0.02 mmol of auxiliary ligand imidazole, 0.18 mmol of organic base, 0.1 mmol of p-bromoacetophenone and 6 mmol of methanol were added to (DMAc), and the total volume of the reaction solution was 5 mL. The reaction mixture was then purged with argon for at least 15 minutes under magnetic stirring to remove oxygen. Photoreactions were performed under the illumination of a xenon lamp equipped with a 400 nm stop filter. The reaction temperature was maintained at 25°C with circulating water cooling. After 8 hours of irradiation, the product p-methoxyacetophenone was obtained with a yield of 97%.
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