Structure and properties of tungsten peroxopolyoxo complexes – Promising catalysts for organics oxidation. I. Structure of peroxocomplexes studied during the stepwise synthesis of tetra(diperoxotungsten)phosphate-tetra-n-butyl ammonium

Structure and properties of tungsten peroxopolyoxo complexes – promising catalysts for organics oxidation. II: Cation type influence on the tungsten peroxocomplex structure

“…This study continues earlier reported investigations [1]. According to the previous studies [2,3], activity of catalytic systems based on molybdenum and tungsten peroxocomplexes depends on the length and structure of quaternary ammonium cation chain.…”

“…NMR spectra were recorded on Bruker AC-200 instrument in CDCl 3 operating at 200.13 MHz for 1 H and 50.32 MHz for 13 C. Solvent resonance was used as internal standard ( 1 H, 7.24 ppm and 13 C, 76.90 ppm). 1 …”

“…This opinion was developed at testing in situ obtained complexes in cycloolefins oxidation yielding epoxides [2] and dicarboxylic acids [3]. However, considering data reported in [1], it seems necessary to study the effect of quaternary ammonium cation on the catalytic activity of peroxocomplexes in organics oxidation in more detail, using such methods as EXAFS and Raman spectroscopy. With this regard we have studied the structural difference of peroxocomplexes with various cations in their solid state.…”

Heteropoly acids-catalyzed organic reactions in water: doubly green reactions

“…HPAs in water have also been used in inorganic chemistry for the synthesis of hybrid nanocomposite membranes (42,43) and many new and diverse catalysts (44)(45)(46)(47)(48)(49)(50)(51)(52). HPAs have been extensively used in analytical chemistry for determination and removal of metal ions like phosphates (49,(53)(54)(55), arsenates (55)(56)(57)(58), arsenic (57)(58)(59)(60)(61)(62)(63)(64), silicates (65)(66)(67)(68), and many other ions (69, 70) from aqueous solutions.…”

“…HPAs have been extensively used in analytical chemistry for determination and removal of metal ions like phosphates (49,(53)(54)(55), arsenates (55)(56)(57)(58), arsenic (57)(58)(59)(60)(61)(62)(63)(64), silicates (65)(66)(67)(68), and many other ions (69, 70) from aqueous solutions. They have also other applications in aqueous systems (71).…”