A green and reusable catalytic system based on silicopolyoxotungstovanadates incorporated in a polymeric material for the selective oxidation of sulfides to sulfones

Frenzel, Romina Alejandra; Palermo, Valeria; Sathicq, Ángel Gabriel; Elsharif, Asma M.; Luque, Rafael; Pizzio, Luis R.; Romanelli, Gustavo Pablo

doi:10.1016/j.micromeso.2020.110584

Cited by 11 publications

(11 citation statements)

References 53 publications

(55 reference statements)

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“…There were more additional spectral signals in 1 HNMR spctra for HLn solution, which due to its tautomeric behaviour in the solution. [39] The tautomer of the enolic and ketonic forms for HLn was detected with 1 H-and 13 C-NMR spectra, which no more observed after complexation with PdLn in the 1 H-and 13 C-NMR spectra.…”

Section: Nmr Spectramentioning

confidence: 95%

“…In the 13 C NMR spectrum of HLn, the three characteristics signals were located at 163.88 (C=O), 163.28 (C=N), and 162.86 ppm (CH=N) (Figure S1b), in which both signals for the C=O and CH=N groups were remarkably shifted due to their participation in the complexation to Pd 2+ ion. They were observed at 184.19 (C=O) and 177.63 ppm (CH=N), whereas the signal of the absorption spectra for the C=N group was not influenced by the coordination to Pd 2+ ion, which was located at 162.70 ppm.…”

Section: Nmr Spectramentioning

confidence: 99%

“…[11] Oxidation organic sulfur precursors catalytically, for example, thiols and sulfides, are extremely enhanced in the academic research and the industrial demands using active oxygenation sources, such as sodium perborate, sodium percarbonate, H 5 IO 6 , and the other reported oxidizing agents. [12,13] The majority of such oxidizing agents are classified as un-ecofriendly with high toxicity and uneconomically favored. On the other hand, H 2 O 2 (an aqueous hydrogen peroxide, as an inorganic oxidant) and t BuOOH (an aqueous tert-butyl hydroperoxide, as an organic oxidant) are well-known as high satisfactory oxidants with high regio-and selective in most of the catalytic redox processes of sulfur compounds.…”

Section: Introductionmentioning

confidence: 99%

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Promoted catalytic potential in sulfides oxidation and biological screening of green Pd (II) and Co (II) complexes of salicylidene isatin hydrazone ligand

Adam

Makhlouf

Mohamed

et al. 2022

Applied Organom Chemis

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Mononucleating complexes of isatin hydrazone sodium sulfonate ligand (HLn) with palladium (II) and cobalt (II) ions: The complexes were synthesized within 1:1 and 2:1 molar ratio of HLn with Pd 2+ and Co 2+ ion in PdLn and Co (Ln) 2 , respectively. The catalytic reactivity of both complexes was examined in the oxidation of sulfides (diphenyl sulfide, dps, and methylphenyl sulfide, mps) using hydrogen peroxide under aerobic conditions. Oxoproducts, dipheylsufoxide, dpo, and methyl phenyl sulfoxide, mpo, are the chemoselective products with detection of large amounts of the unselective further oxidation products of dioxoproducts (dipheylsufone, dpn, and methylphenyl sulfone, mpn). The homogenous catalyst of Co (Ln) 2 revealed more efficient action compared to that of PdLn depending on the high electrochemical reversible potential of the central metal ion in the catalytic reaction within the electron and/or oxygen transfer system. Exploring the importance of the M 2+ ion in the coordinated ligand, the bioreactivity of HLn, PdLn, and Co (Ln) 2 was illustrated within some commonly well-known bacteria and fungi strains. Additionally, they were involved as anticancer reagents against some human cancer cell lines in vitro. Both metal complexes presented high inhibited action versus the growth of the studied microorganism and cancer. The interaction effect of Pd 2+ and Co 2+ ions in their pincer complexes was tested with calf thymus DNA spectroscopically and via the viscosity changes.

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Section: Nmr Spectramentioning

confidence: 95%

Section: Nmr Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Promoted catalytic potential in sulfides oxidation and biological screening of green Pd (II) and Co (II) complexes of salicylidene isatin hydrazone ligand

Adam

Makhlouf

Mohamed

et al. 2022

Applied Organom Chemis

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“…HPCs are used in photocatalysis [4,5], biochemistry and pharmacology [6][7][8]. The special role of HPCs as catalysts of various chemical reactions, mainly associated with oxidation processes [9,10] and, in particular, desulfurization [11][12][13], should be noted. In connection with the industrial importance of HPCs, the scienti c direction aimed at the synthesis of new heteropoly compounds has become widespread [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The special role of HPCs as catalysts of various chemical reactions, mainly associated with oxidation processes [9,10] and, in particular, desulfurization [11][12][13], should be noted. In connection with the industrial importance of HPCs, the scienti c direction aimed at the synthesis of new heteropoly compounds has become widespread [13][14][15]. This results in the need to study the structure and physicochemical properties of new compounds.…”

Section: Introductionmentioning

confidence: 99%

Application of laser desorption/ionization for investigation of phosphomolybdic acid

Minenkova

Emel’yanov

Tarkhanova

et al. 2022

Preprint

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Heteropoly compounds are of great practical importance as components of catalysts. In particular, phosphomolybdic acid H3PMo12O40 is widely used in catalytic oxidation processes. For heterogeneous catalysts, one of the effective methods for studying their structure is mass spectrometry. In this work, the main patterns of fragmentation of crystalline phosphomolybdic acid and its aqueous solutions are studied by laser desorption/ionization. It has been found that during laser desorption/ionization, acid crystals tend to form particles of the cluster type (MoO3)n and HPO3∙(MoO3)n. When registering positive ions, particles with a mixed oxidation state of Mo+ 5 and Mo+ 6 were detected. Clusters of molybdenum (VI) oxide were found in the study of aqueous solutions of acid. In the study of aqueous solutions together with a matrix of 2,5-dihydroxybenzoic acid, particles containing a hydrated molecular ion were found. Clusters with a molecular ion were identified: H3PMo12O40∙(MoO3)3, H3PMo12O40∙(MoO3)4, H3PMo12O40∙MoO3∙4H2O, H3PMo12O40∙(MoO3)2∙2H2O, H3PMo12O40∙(MoO3)2∙4H2O, and H3PMo12O40∙(MoO3)3∙2H2O. When studying the influence of the LDI parameters on the informativity of the mass spectrum, it was found that, in the general case, the values of the peak intensity and the laser power, as well as the number of shots, are in symbatic dependence. The intensity of the peak depends largely on the power of the laser than on the number of shots. Thus, it has been shown that, upon ionization, phosphomolybdic acid can generate both fragments and cluster ions containing mainly the adduct of the molecular ion with molybdenum oxide and water.

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Application of matrix‐assisted laser desorption/ionization in the studies of phosphotungstic acid

Minenkova,

Lebedev,

Buryak

2024

Rapid Comm Mass Spectrometry

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RationalePhosphorotungstic acid (PTA) has many applications, especially in the field of catalysis, due to its structural properties. However, the structure of PTA is studied mainly using theoretical methods. Matrix‐assisted laser desorption/ionization (MALDI) has the potential to be an effective method for the experimental study of heteropolyacids. Limitations of MALDI are the high molecular weight of the particles and the complex distribution of isotopic peak intensities. Both problems can be solved by automatically identifying observed signals by generating hypothetical molecular formulas and estimating their isotopic distributions.MethodsPhosphotungstic acid was studied under conditions of laser desorption/ionization in the absence and in the presence of the matrix. Three types of matrices were used: 2,5‐dihydroxybenzoic acid in water, α‐cyano‐4‐hydroxycinnamic acid in acetonitrile, and sinapic acid (SA) in tetrahydrofuran. Part of the peaks in the resulting mass spectra was identified using in‐house developed software that implements the automated isotopic distribution brute force.ResultsThe most informative mass spectra were obtained using SA as the matrix, which enabled the detection of particles containing PTA dimers for the first time. The compositions of particles incorporating PTA dimers were determined in an automated manner and can be written as [H3PW12O40]2·2H2O (m/z = 5791.2 Da) and [H3PW12O40]2·4H2O (m/z = 5836.5 Da). Other observed species included (WO3)n·PO3−, HPO2·(WO3)n, and WO2·(WO3)n clusters, with the latter containing W in mixed oxidation states.ConclusionsThe combined use of MALDI and an automated identification procedure provided valuable experimental data on the structure and fragmentation of phosphotungstic acid. To the best of our knowledge, this study was the first to report on particles containing phosphotungstic acid dimers.

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A green and reusable catalytic system based on silicopolyoxotungstovanadates incorporated in a polymeric material for the selective oxidation of sulfides to sulfones

Cited by 11 publications

References 53 publications

Promoted catalytic potential in sulfides oxidation and biological screening of green Pd (II) and Co (II) complexes of salicylidene isatin hydrazone ligand

Promoted catalytic potential in sulfides oxidation and biological screening of green Pd (II) and Co (II) complexes of salicylidene isatin hydrazone ligand

Application of laser desorption/ionization for investigation of phosphomolybdic acid

Application of matrix‐assisted laser desorption/ionization in the studies of phosphotungstic acid

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