02275nas a2200253   4500008004100000022001400041245016000055210006900215260000800284300001600292490000700308520136500315653002001680653002201700653002701722653001901749653002601768100001601794700001901810700002101829700001801850700002201868856013101890       2020                        eng d  a1944-824400aNanocrystalline Ag3PO4 for sunlight- and ambient air-driven oxidation of amines: high photocatalytic efficiency and a facile catalyst regeneration strategy0 aNanocrystalline Ag3PO4 for sunlight and ambient airdriven oxidat  cJUL  a29324-293340 v123 a<p>Selective oxidation of amines to imines using sunlight as clean and renewable energy source is an important but challenging chemical transformation because of high reactivity of the generated imines and lack of visible light-responsive materials with high conversion rates. In addition, oxygen gas has to be purged in the reaction mixture in order to increase the reaction efficiency which, in itself, is an energy-consuming process. Herein, we report, for the first time, the use of Ag3PO4 as an excellent photocatalyst for the oxidative coupling of benzyl amines induced by ambient air in the absence of any external source of molecular oxygen at room temperature. The conversion efficiency for the selective oxidation of benzyl amine was found to be greater than 95% with a selectivity of &gt;99% after 40 min of light irradiation indicating an exceptionally high conversion efficiency with a rate constant of 0.002 min(-1), a turnover frequency of 57 h(-1), and a quantum yield of 19%, considering all of the absorbed photons. Ag3PO4, however, is known for its poor photostability owing to a positive conduction band position and a favorable reduction potential to metallic silver. Therefore, we further employed a simple catalyst regeneration strategy and showed that the catalyst can be recycled with negligible loss of activity and selectivity.</p>
10aamine oxidation10aenergy harvesting10ananocrystalline Ag3PO410aPhotocatalysis10aregeneration strategy1 aGarg, Reeya1 aMondal, Sanjit1 aSahoo, Lipipuspa1 aVinod, C., P.1 aGautam, Ujjal, K.  uhttps://library.ncl.res.in/content/nanocrystalline-ag3po4-sunlight-and-ambient-air-driven-oxidation-amines-high-photocatalytic