Early-Time Dynamics and Reactivity of Polyoxometalate Excited States. Identification of a Short-Lived LMCT Excited State and a Reactive Long-Lived Charge-Transfer Intermediate following Picosecond Flash Excitation of [W10O32]4- in Acetonitrile

Duncan, Dean C.; Netzel, Thomas L.; Hill, Craig L.

doi:10.1021/ic00122a021

Cited by 179 publications

(151 citation statements)

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“…FT-IR spectra confirm that the structure of decatungstate is still preserved inside the hybrid films. [21] The frequencies of the W-O stretching modes are observed at n 958, 890, 803 cm…”

Section: Resultsmentioning

confidence: 99%

“…The lipophilic salt of decatungstate [21] (n-Bu 4 N) 4 W 10 O 32 has been occluded in different polymeric membranes using a phase inversion technique [33] or a hydrosilylation reaction. [34] Four polymers, characterised by a high thermal, chemical and mechanical stability were chosen for the preparation of photocatalytic membranes: polysulfone (PSf), a modified polyether-ether ketone (PEEK-WC), polyvinylidene fluoride (PVDF) and polydimethylsiloxane (PDMS) (Scheme 2).…”

Section: Resultsmentioning

confidence: 99%

“…(n-Bu 4 N) 4 W 10 O 32 was prepared following a literature procedure. [21] PSf was supplied from Amaco under the trade name Udel ¾ . PEEK-WC was from the Chanchung Institute of Applied Chemistry, Academia Sinica.…”

Section: Experimental Section General Remarksmentioning

confidence: 99%

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Heterogeneous Photooxidation of Alcohols in Water by Photocatalytic Membranes Incorporating Decatungstate

et al. 2003

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The incorporation of decatungstate in polymeric membranes provides new heterogeneous photocatalysts for the oxidation of organic substrates performed in water under an oxygen atmosphere at 25 8C. The photooxidation of water-soluble alcohols proceeds to completion, forming the carbonyl derivative as an intermediate, and leading to degradation products with a COD loss up to 70%. Solid state characterisation techniques (SEM, IR) together with solution UV-VIS analysis and kinetic studies allowed us to identify, among diverse polymeric materials, the PDMS-based system as leaching-free under irradiation and recyclable up to >300 turnovers (4 runs) with no major loss of activity. Membrane induced discrimination of the substrate results from the oxidations of a series of alcohols, through comparison with the homogeneous reactions.

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“…FT-IR spectra confirm that the structure of decatungstate is still preserved inside the hybrid films. [21] The frequencies of the W-O stretching modes are observed at n 958, 890, 803 cm…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Heterogeneous Photooxidation of Alcohols in Water by Photocatalytic Membranes Incorporating Decatungstate

et al. 2003

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“…HPAs have several advantages as catalysts which make them economically and environmentally attractive [1][2][3]. On the other hand, HPAs have a very strong Brønsted acidity, approaching the super acid region on the other, they are efficient oxidants, exhibiting fast reversible multi electron redox transformations under rather mild conditions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of nanocomposite based on polymer as a highly effective supported catalyst in oxidation of alkenes

Salavati

Teimouri

Kazemi

2017

Asain J. Green Chem.

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Polyphosphotungstate (denoted as PPT) was supported on polypyrrol as organic support (abbreviated as PTT@Ppy) to produce catalytic active supported catalyst. This catalyst was characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Field emission scanning electron microscopy (FESEM) and UV-vis diffuse reflectance spectroscopy (UV-DRS). The catalyst showed high catalytic activity in the oxidation of alkenes under optimized conditions. In this work, cyclooctene was selected as model alkene for investigation of oxidation procedure, and then under optimized condition, other alkenes were examined. The catalyst could be readily separated from the catalytic system using the centrifuging and loss of activity was negligible when the catalyst was recovered in five consecutive cycles. For this research, a statistical method called response surface methodology (RSM) has been used to economize the number of experiments and their meaningful interpretation. The effect of various factors such as catalyst amount, time, oxidant amount and temperature on oxidation of alkenes were investigated. Optimization results for 0.2 mmol cyclooctene showed that maximum oxidation efficiency 88% was achieved at the optimum conditions: catalyst amount 200 mg, temperature 63, time 5 h and oxidant = 2.15 mmol. KEYWORDS Heteropolyacid Polymer Oxidation Alkenes Support Graphical AbstractSynthesis and characterization of nanocomposite based on polymer … 99

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“…[26] The photocatalytic properties of W10 have been extensively investigated in water [27] and in organic solvents. [28] W10 has been widely used for the photocatalytic oxidation of organic molecules and for the degradation of organic pollutants such as phenol and its derivatives, which are among the most significant toxic pollutants in wastewater. [29] Phenols are included in several priority lists of pollutants; consequently, the development of new effective methods for their degradation, such as advanced oxidation processes, is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

A New Generation of Catalytic Poly(vinylidene fluoride) Membranes: Coupling Plasma Treatment with Chemical Immobilization of Tungsten‐Based Catalysts

Lopez

Buonomenna

Fontananova

et al. 2006

Adv Funct Materials

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A new generation of catalytically active membranes for secondary amine oxidation and phenol degradation has been developed by coupling the advantages of low‐temperature plasma‐modification processes with surface chemical immobilization reactions of catalysts. Poly(vinylidene fluoride) membranes have been modified with NH3 radiofrequency glow discharges in order to graft amino groups at their surface, providing active sites for stable immobilization of tungsten‐based heterogeneous catalysts. Particular attention has been focused on tungstate, WO42–, and decatungstate, W10O324–, which act efficiently as catalysts for the oxidation of secondary amines and as photocatalysts for the degradation of organic pollutants, respectively. Plasma‐modified membranes surface‐tailored with WO42– have been used in catalytic membrane reactors to activate hydrogen peroxide for oxidizing secondary amines to nitrones; membranes modified with W10O324– have been used for the complete degradation of phenol. The obtained results, in terms of amine–nitrone conversion and phenol degradation, respectively, appear extremely promising; these modified membranes can be considered as a pioneering, successful example of heterogenization of W‐based catalysts on plasma‐treated membranes.

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Early-Time Dynamics and Reactivity of Polyoxometalate Excited States. Identification of a Short-Lived LMCT Excited State and a Reactive Long-Lived Charge-Transfer Intermediate following Picosecond Flash Excitation of [W10O32]4- in Acetonitrile

Cited by 179 publications

References 0 publications

Heterogeneous Photooxidation of Alcohols in Water by Photocatalytic Membranes Incorporating Decatungstate

Heterogeneous Photooxidation of Alcohols in Water by Photocatalytic Membranes Incorporating Decatungstate

Synthesis and characterization of nanocomposite based on polymer as a highly effective supported catalyst in oxidation of alkenes

A New Generation of Catalytic Poly(vinylidene fluoride) Membranes: Coupling Plasma Treatment with Chemical Immobilization of Tungsten‐Based Catalysts

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