Peroxo and Superoxo Complexes of Chromium, Molybdenum, and Tungsten

Dickman, Michael H.; Pope, Michael T.

doi:10.1021/cr00027a002

Cited by 424 publications

(250 citation statements)

References 53 publications

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“…Some molybdates show antiviral, antitumoral or antibiotic activity [5][6][7]. They are also known as efficient catalysts for the oxidation of various organic compounds with different oxygen donors like ROOH [8][9][10][11][12][13][14][15][16][17][18][19][20] and H 2 O 2 [21][22][23][24][25][26][27][28][29]. Molybdenum(VI) dioxo or oxodiperoxo compounds are commonly encountered in oxidation catalysis.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Complexes as Catalysts for the Oxidation of Cycloalkanes with Molecular Oxygen

et al. 2016

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A group of new polymolybdates was synthesized and tested in the catalytic oxidation of cycloalkanes. Investigated compounds exhibit broad structural diversity including polymolybdates with isolated anionic clusters (0-dim), polymeric anions (1-dim), Mo-O layers (2-dim) as well as hexagonal and orthorhombic molybdenum oxides (3-dim). All studied molybdenum complexes were found to be active in the reaction conditions yielding ketones and alcohols as main products. In the case of layered compounds (2-dim), dicarboxylic acid was detected in the mixture of reaction products. The structure of investigated molybdenum compounds was shown to have influence on yields and selectivities of the investigated reactions. Anionic layers separation (in 2-dim materials) as well as type and charge of organic cations present in the compounds are prime examples of structural factors influencing the oxidation reactions efficiencies. On the basis of obtained results and literature reports a mechanism for the oxidation of cycloalkanes by polymolybdates has been proposed. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

Molybdenum Complexes as Catalysts for the Oxidation of Cycloalkanes with Molecular Oxygen

et al. 2016

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“…The blue reaction product is a diperoxo chromium oxide complex [5,6], which is subsequently extracted into ether. The overall reaction of chromates with hydrogen peroxide in acidic media is represented by equation (1) [7], the overall oxidation reaction by eq.…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation reaction takes place in two steps. First, the monoperoxo compound is formed from chromic acid [6,7,21]; see eq. (2a).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Peroxides and Chromium Compounds – The Ether Test for Identity

Buchera¹,

Kampe²,

Roelcke³

2005

Zeitschrift Für Naturforschung B

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Chromium compounds and hydrogen peroxide are usually identified by their reaction to form blue chromium oxide peroxide hydrate, which is extracted with diethyl ether as a co-ligand. Findings suggest that diethyl ether can be replaced without loss in analytical performance using solvents from the alcohol, arene, ester, ether, halogenated hydrocarbon, and ketone series. DFT calculations have been performed for several solvates. Results indicate that some of the solvates studied may exist as two rotamers.

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“…Therefore, the application of anionic precursors with reduced nuclearity for synthesis of zirconiasupported WO x species can increase the ion-exchange capacity of the support and improve the dispersion of the adsorbed species. Low-condensed anionic oxoperoxometalate species can be generated dissolving metavanadates [19], polyoxomolybdates or -tungstates [20] in an excess of hydrogen peroxide at pH 0.5-2. We used this experimental fact to develop a ''peroxo route'' for synthesis of VO x / ZrO 2 catalysts involving equilibrium adsorption of M. Kantcheva (&) Á C. Koz Laboratory for Advanced Functional materials, Department of Chemistry, Bilkent University, 06800 Bilkent, Ankara, Turkey e-mail: margi@fen.bilkent.edu.tr peroxovanadium(V) ions on stabilized zirconia in aqueous solutions at low pH [21].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic characterization of tungstated zirconia prepared by equilibrium adsorption from hydrogen peroxide solutions of tungsten(VI) precursors

Kantcheva

Koz

2007

J Mater Sci

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. The starting material is amorphous zirconium oxyhydroxide. The maximum W densities obtained are larger than that reported in the literature for systems synthesized by the same method using aqueous non-peroxide solutions. In the case of the metatungstate precursor, this increase is attributed to the generation of additional anchoring sites by interaction between the amorphous support and H 2 O 2 . The high uptake achieved when the peroxo complex is used as a precursor is a result of both the ZrO x (OH) 4-2x -H 2 O 2 interaction and low nuclearity of the adsorbing anion. The materials are characterized by XRD, DR-UV-vis, Micro-Raman and FT-IR spectroscopy. The surface acidities of samples with identical W loading prepared by equilibrium adsorption from the [H 2 W 12 O 40 ] 6--H 2 O 2 system and by impregnation with aqueous solution of ammonium metatungstate are investigated by FT-IR spectroscopy of CO adsorbed at 80 K.

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Peroxo and Superoxo Complexes of Chromium, Molybdenum, and Tungsten

Cited by 424 publications

References 53 publications

Molybdenum Complexes as Catalysts for the Oxidation of Cycloalkanes with Molecular Oxygen

Molybdenum Complexes as Catalysts for the Oxidation of Cycloalkanes with Molecular Oxygen

Peroxides and Chromium Compounds – The Ether Test for Identity

Spectroscopic characterization of tungstated zirconia prepared by equilibrium adsorption from hydrogen peroxide solutions of tungsten(VI) precursors

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