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Visible light-triggered vanadium-substituted molybdophosphoric acids to catalyze liquid phase oxygenation of cyclohexane to KA oil by nitrous oxide

“…2 a), in accordance with previous report [50]. The strong absorption band at λ near 220 nm should originate from oxygen to molybdenum charge transfer (LMCT) of the Mo=Od bonds and another weak LMCT band at λ= 308 nm should originate from the Mo-Ob(c) bonds in the Keggin structure [50,51]. Also, three PMo12-nVn acids exhibited the two LMCT bands described above in their UV-Vis spectra, indicating that they have a similar Keggin structure to the parent PMo12.…”

Vanadium‐Substituted Tungstophosphoric Acids as Efficient Catalysts for Visible‐Light‐Driven Oxygenation of Cyclohexane by Dioxygen

“…Notably, ad ecrease, blueshift, and broadening of the Keggins tructural band weren oticedf or the PWV acids, and these phenomena becamem ore prominent with increasing incorporation of V atoms (curves b-d). This should be caused by the incorporation of vanadium into the primary structure of the PW acid leadingt or educed structural symmetry, [58] which is consistent with the above FTIR characterizations. In addition, the Keggin absorption band centered approximately 244-265nmi nt hese heteropolyacids presented an absorption edge prolonged to the visible region of 380-500 nm and the absorbance in such visible region was gradually strengthened with the substituted Va tom numbers.…”

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

“…Most of the heteropoly salts are insoluble in non-polar solvents such as benzene, toluene and hydrocarbons and these are known to act as catalysts even in insoluble reaction medium [28][29][30][31][32][33]. Copper salts of HPA (CuHPA) have been used in some organic transformations [34][35][36][37][38]. Copper salt of silicotungstic acid (CuSTA) has been used as a catalyst in hydroxylation of phenol [39].…”