Influence of tetraalkylammonium cations on quality of decatungstate and its photocatalytic property in visible light-triggered selective oxidation of organic compounds by dioxygens

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

“…The addition of HCl solution mainly contributes to stabilize the excited state. [16,35] Transient absorption (TA) spectra: TA spectroscopy, as a forceful tool to evaluate the lifetime of the photo-excited state, Table 1. The crystal parameters of DT and 1 %Mo-DT by single crystal structure analysis.…”

“…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.…”

Mechanistic Studies on the Photooxidation of 5‐Hydroxymethylfurfural by Polyoxometalate Catalysts and Atmospheric Oxygen

“…Also, given the rich redox chemistry and fascinating photoinduced charge-transfer property, polyoxometalates, especially decatungstate polyanion (W 10 O 32 4À ), have been widely investigated in photocatalytic formation of CÀ X (X=N, Si, F) bond, [27] aerobic oxidation of organic substrates (e. g. aliphatic and aromatic alcohols, cyclohexane, etc.). [28][29][30][31] However, to our knowledge, there is only one report on the photocatalytic oxidation of HMF by polyoxometalate catalyst in the presence of HBr additive. [32] Herein, we report the light-induced oxidation of HMF to various furanic products using polyoxometalate catalysts and atmospheric oxygen as oxidant under mild conditions.…”

Visible‐Light‐Triggered Quantitative Oxidation of 9,10‐Dihydroanthracene to Anthraquinone by O2 under Mild Conditions

“…In recent years, light-triggered chemicalr eactions have emergeda sp owerful synthesis techniques for the production of fine chemicals under mild reactionc onditions. [33][34][35] In particular,t he selectiveo xidation of organic compoundsb ydioxygen (O 2 )o ra ir under visible light is believed to be user-and environmentally friendly,and thus, of great academic and practical significance. [36,37] Herein, we report an atom-efficient and ecofriendly photo-oxidation protocol for the synthesis of AQ from DHA withouta ny extra catalysts or additives under ambient temperature and pressure, which can fully meet the requirements ofg reen chemistry principles.…”

“…In recent years, light‐triggered chemical reactions have emerged as powerful synthesis techniques for the production of fine chemicals under mild reaction conditions . In particular, the selective oxidation of organic compounds by dioxygen (O 2 ) or air under visible light is believed to be user‐ and environmentally friendly, and thus, of great academic and practical significance .…”