Hybridizing engineering strategy of non-lacunary (nBu4N)4W10O32 by carbon quantum dot with remarkably enhanced visible-light-catalytic oxidation performance

Hybridizing Engineering Strategy of Decatungstate. 2. Regulated Effect of Doping Transition Metal Ions on Photocatalytic Oxidation Performance of (nBu4N)4W10O32

“…The PL spectral technique, as a forceful tool to evaluate the stability (or lifetime) of the photoexcited state, was used to study the photocatalytic systems of TBADT and its hybrids. As previously reported by us, , a PL spectrum of TBADT displayed a strong and broad PL peak at 350–550 nm in MeCN under 320 nm light excitation; the doping of M n + ions in TBADT resulted in a remarkable decay of this PL signal. Moreover, such decay was gradually strengthened with a change of the dopant from Fe 3+ , Fe 2+ , and Co 2+ to Ni 2+ (Figure a).…”

“…However, to the best of our knowledge, the efficient HE strategy for improving the photocatalytic performance of TBADT is still rare, which may be due to the unstable structure and nonvacancy character of TBADT. The only successful example is our recently reported carbon quantum dot (CQD)-hybridized TBADT with a remarkably enhanced visible-light catalytic performance …”

Redox-active and Brønsted basic dual sites for photocatalytic activation of benzylic C–H bonds based on pyridinium derivatives

“…Significant efforts have been devoted to exploring effective ways of photocatalytic oxidation of the C-H bond, in particular with the use of molecular oxygen as the green and sustainable oxidant. [11][12][13][14][15][16][17][18][19][20][21] Since direct catalytic oxidation by molecular oxygen is often kinetically unfavorable due to the spin-restriction of its triplet ground state, 22 an innovative alternative has been developed by first abstracting hydrogen from the C-H bond to form a carbon radical, which subsequently reacts with molecular oxygen to produce oxygenated compounds. 23,24 The representative approaches include the employment of N-oxyl radicals for H abstraction from the C-H bond in the presence of radical initiators, 25,26 decatungstatemediated photocatalysis with the assistance of acids or metal salts, 27,28 cercosporin or benzoquinone derivative inspired photooxidation with additives or cocatalysts, 29 semiconductor photocatalytic oxidation in which photogenerated holes drive the dissociation of the C-H bond to form alkyl radical intermediates, etc.…”

Molybdenum Isomorphously Substituted Decatungstates as Robust and Renewable Photocatalysts for Visible Light‐Driven Oxidation of Hydrocarbons by Molecular Oxygen

“…Some efficient strategies have been developed to improve the DT-based photo-catalysis systems, including the use of Fe(III) porphyrins as co-catalysts [12] the use of g-C 3 N 4 /rGO [13] and C 6 (MIm) 2 2 + counter cation [14] to improve the visible absorption and structural stability of DT, respectively. Recently, our research groups have developed simple and efficient modifications or hybridizing engineering (HE) strategies to enhance the visible-light-catalytic performance of DT in the O 2 -based selective oxidations, including the use of acidic additives, [15] C 1 -C 4 alkyl quaternary ammonium cations, [16] CQDs [17] and transition metal ions [18] dopants to overcome the above defects of DT and fine-regulate the synthetic quality, redox ability and photo-physiochemical properties of DT at the molecular level. [16] And the HE strategy of metal heteroatom skeleton substitution in lacunary polyoxometalates (POMs) has been extensively used to improve the quality of POMs and extend metal-to-POMs charge transfer and excited-state lifetimes, [19,20] but so far, it has not been used in DT likely owing to DT's non-lacunary and variable structure.…”