Highly Selective Oxidation of Sulfides to Sulfones by H2O2 Catalyzed by Porous Capsules

Haddadi, Hedayat; Korani, Elahe Mokhtari; Hafshejani, Shahrbanou Moradpour; Farsani, Mostafa Riahi

doi:10.1007/s10876-015-0896-4

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…Meanwhile, most of sulfones have a wide range of biological activities (showing good effects in insecticide, bactericidal, antiviral, and other drugs) and have been widely used in pesticides, medicine, and other fields . However, there are still some problems hindering the development of the oxidation of thioethers, including high-temperature reaction requirement, ,, the selectivity of products (sulfoxide and sulfone), − the stability of catalysts, etc. Therefore, the solution to overcome a series of problems is to design and explore a kind of mild, highly selective, and stable catalyst.…”

Section: Resultsmentioning

confidence: 99%

ZnO–POM Cluster Sub-1 nm Nanosheets as Robust Catalysts for the Oxidation of Thioethers at Room Temperature

2021

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Two-dimensional (2D) zinc oxides have attracted more and more research interests due to their unique properties. Yet, it remains a great challenge to limit the thickness to the sub-1 nm scale and further combine with other components to obtain 2D hybrid zinc oxide (ZnO)-based sub-1 nm materials. Herein, a versatile strategy was successfully developed to realize the controllable preparation of ZnO–polyoxometalate (POM)-based 2D hybrid sub-1 nm nanosheet (HSNS) superstructures by incorporating three kinds of molybdenum-based POM clusters into the zinc oxide system. Molecular dynamics simulation results demonstrated that POM clusters interact with ZnO/Zn(OH)2 molecules and coassembled into stable 2D HSNSs. Significantly, theses materials as robust catalysts showed excellent catalytic activity, selectivity, and stability in the oxidation of thioethers at room temperature, which partly can be attributed to the special 2D sub-1 nm nanostructures with large specific areas leading to the full exposure of active sites. Meanwhile, the synergetic effect of multiple components also played an important role during the catalytic process. Thus, this work would pave the way for the precise synthesis of multicomponent 2D hybrid sub-1 nm materials for widespread applications.

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Section: Resultsmentioning

confidence: 99%

ZnO–POM Cluster Sub-1 nm Nanosheets as Robust Catalysts for the Oxidation of Thioethers at Room Temperature

2021

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“…POMs with a Keplerate structure are giant metal-oxide-based spherical clusters in which 12 pentagonal [(Mo)–Mo 5 O 21 (H 2 O) 6 ] 6– units are linked to each other by 30 linkers such as {Mo V 2 O 4 }, producing a water-soluble spherical {Mo 132 }. The use of Cr III aq and Fe III aq as linkers generates mixed metal Keplerates {Mo 72 M 30 } (M = Cr, Fe) exhibiting unique optical, electronic, and magnetic properties. , They are attractive materials in diverse disciplines, such as chemistry, physics, magnetism, medical sciences, materials science, nanoscience, and even mathematics. − Although catalysis and photocatalysis are well-developed in the POMs community, to our knowledge, the catalysis − and particularly photocatalysis − by Keplerate are still unknown. The crystallinity, morphology, and consequently solubility of some Keplerates could be easily controlled by synthetic procedures.…”

Section: Introductionmentioning

confidence: 99%

{Mo₇₂Fe₃₀} Nanoclusters for the Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Garazhian

Rezaeifard

Jafarpour

et al. 2019

ACS Appl. Nano Mater.

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The photocatalytic efficiency of ecofriendly Keplerate {Mo72Fe30} nanoclusters in degradation of hazardous organic dyes such as rhodamine B (RhB) under visible/solar light is exploited. A higher photoremoval activity was observed for amorphous {Mo72Fe30} than its crystalline counterparts and other Keplerates. The greater specific surface area (SBET) and, particularly, pore volume (V BJH) of the amorphous {Mo72Fe30} cluster than those of its rhombohedral crystal (3- and 28-fold for SBET and V BJH, respectively) as well as negative charges on its surface (ζ = −16.2 mv) are important factors for such a superiority. The negative effect of increasing the pH of the solution on the removal rate along with scavenging experiments and photoluminescence (PL) study excluded the involvement of OH• in photodegradation process. Instead, an electron transfer from the excited dye (RhB*) to the POM producing RhB +· , and reduced POM (POM–) is postulated as a possible mechanism for photoassisted degradation of dye under visible light. The nanocluster proved to be a recyclable photocatalyst with high durability as evidenced by FT-IR, Raman, XRD, EDX, and XPS spectral data.

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“…In the present work, we thus report assays of two distinct synthetic routes to enzymatically synthesize functional polyesters based on ε-caprolactone (CL) and two selected natural amino acids. Cysteine (Cys) and methionine (Met) have been selected since their respective side groups present adequate chemical functions: (i) a thiol for cysteine, which allows subsequent branching, grafting or cross-linking; and (ii) a thioether for methionine that could allow a control of the polymer thermal resistance, for example by sulfonation of the thioether [ 47 ]. A protection–unprotection approach of the chemical groups has been used and then two different strategies were tested: (i) preliminary tests based on direct polymerization, using methionine and cysteine amino acids; and (ii) an indirect approach, involving protected cysteine.…”

Section: Introductionmentioning

confidence: 99%

Enzymatic Synthesis of Amino Acids Endcapped Polycaprolactone: A Green Route Towards Functional Polyesters

Duchiron

Pollet

Givry³

et al. 2018

Molecules

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ε-caprolactone (CL) has been enzymatically polymerized using α-amino acids based on sulfur (methionine and cysteine) as (co-)initiators and immobilized lipase B of Candida antarctica (CALB) as biocatalyst. In-depth characterizations allowed determining the corresponding involved mechanisms and the polymers thermal properties. Two synthetic strategies were tested, a first one with direct polymerization of CL with the native amino acids and a second one involving the use of an amino acid with protected functional groups. The first route showed that mainly polycaprolactone (PCL) homopolymer could be obtained and highlighted the lack of reactivity of the unmodified amino acids due to poor solubility and affinity with the lipase active site. The second strategy based on protected cysteine showed higher monomer conversion, with the amino acids acting as (co-)initiators, but their insertion along the PCL chains remained limited to chain endcapping. These results thus showed the possibility to synthesize enzymatically polycaprolactone-based chains bearing amino acids units. Such cysteine endcapped PCL materials could then find application in the biomedical field. Indeed, subsequent functionalization of these polyesters with drugs or bioactive molecules can be obtained, by derivatization of the amino acids, after removal of the protecting group.

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Highly Selective Oxidation of Sulfides to Sulfones by H2O2 Catalyzed by Porous Capsules

Cited by 9 publications

References 31 publications

ZnO–POM Cluster Sub-1 nm Nanosheets as Robust Catalysts for the Oxidation of Thioethers at Room Temperature

ZnO–POM Cluster Sub-1 nm Nanosheets as Robust Catalysts for the Oxidation of Thioethers at Room Temperature

{Mo₇₂Fe₃₀} Nanoclusters for the Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Enzymatic Synthesis of Amino Acids Endcapped Polycaprolactone: A Green Route Towards Functional Polyesters

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Highly Selective Oxidation of Sulfides to Sulfones by H2O2 Catalyzed by Porous Capsules

Cited by 9 publications

References 31 publications

ZnO–POM Cluster Sub-1 nm Nanosheets as Robust Catalysts for the Oxidation of Thioethers at Room Temperature

ZnO–POM Cluster Sub-1 nm Nanosheets as Robust Catalysts for the Oxidation of Thioethers at Room Temperature

{Mo72Fe30} Nanoclusters for the Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Enzymatic Synthesis of Amino Acids Endcapped Polycaprolactone: A Green Route Towards Functional Polyesters

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About

{Mo₇₂Fe₃₀} Nanoclusters for the Visible-Light-Driven Photocatalytic Degradation of Organic Dyes