Polyoxometalate Complexes in Organic Oxidation Chemistry

β,β-Isomer of Open-Wells–Dawson Polyoxometalate Containing a Tetra-Iron(III) Hydroxide Cluster: [{Fe4(H2O)(OH)5}(β,β-Si2W18O66)]9−

“…All elements (H, Fe, K, O, Si, and W) were analyzed for a total of 99.74%, indicating that the obtained compound was highly pure. The observed data was in accordance with the calculated values for the formula constituting four water molecules, i.e., K 9 [{Fe 4 …”

“…On the other hand, the BVS values of two inner edge-sharing oxygen atoms (O68, 0.796 and O70, 0.660; Table S1) were slightly lower than those of other oxygen atoms connected to the iron atoms. These results suggested that there is one proton between two oxygen atoms (O68 and O70), i.e., the iron(III) cluster in the open pocket can be represented as {Fe 4 Table S1). These results were consistent with elemental analysis of the potassium salt of β,β- …”

“…In summary, we prepared a β,β-isomer of open-Wells-Dawson POM containing a tetra-iron(III) cluster, K 9 [{Fe 4 …”

“…Polyoxometalates (POMs) are discrete metal oxide clusters that are of interest as soluble metal oxides, with applications in catalysis, medicine, and materials science [1][2][3][4][5][6][7][8][9][10][11][12][13]. Recently, the open-Wells-Dawson POMs have been an emerging class of POMs [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] [29].…”

Simple and Green Adipic Acid Synthesis from Cyclohexanone and/or Cyclohexanol Oxidation with Efficient (NH4)xHyMzPMo12O40 (M: Fe, Co, Ni) Catalysts

“…Polyoxometalates (POMs), large family of anionic metal-oxygen clusters, having chemical properties such as strong oxidative powers and strong Brönsted and Lewis acidities have especially received much attention in the area of the oxidation catalysis [11][12][13][14]. The POMs based on molybdenum, particularly, can act as effective catalysts for the H2O2-and O2-based green oxidations [15][16][17].…”