First electrosynthesis of transition metal peroxo complexes. Synthesis, characterization and reactivity of molybdenum and tungsten heteroligand peroxo complexes

Chakravorti, M. C.; Ganguly, Suvankar; Bhattacharjee, Manish

doi:10.1016/s0277-5387(00)87053-9

Cited by 20 publications

(8 citation statements)

References 10 publications

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“…It is known that metal or metal oxides powders, such as molybdenum, , tungsten, titanium, and vanadium oxides, can be dissolved in the hydrogen peroxide (H 2 O 2 ) aqueous solution, which has inspired us to find an environmentally friendly route to nanostructures of metal oxides. In the present work, it is found that the synthesis of MoO 3 nanostructures is affected by the reaction parameters, such as reaction time and the molar ratio of molybdenum and H 2 O 2 .…”

Section: Resultsmentioning

confidence: 99%

Molybdenum Trioxide Nanostructures: The Evolution from Helical Nanosheets to Crosslike Nanoflowers to Nanobelts

Jiang

Pang

et al. 2006

J. Phys. Chem. B

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MoO(3) nanostructures with different morphologies, such as helical nanosheets, crosslike nanoflowers, and nanobelts, have been synthesized on a large scale by an environmentally friendly chemical route. The evolution process from helical nanosheets to crosslike nanoflowers to nanobelts is observed for the first time. The influences of reaction time and the molar ratio of molybdenum and H(2)O(2) on the morphologies of MoO(3) nanostructures have been investigated. The synthetic process is environmentally friendly and may be extended to synthesize nanostructures of other metal (W, Ti, and Cr) oxides.

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Section: Resultsmentioning

confidence: 99%

Molybdenum Trioxide Nanostructures: The Evolution from Helical Nanosheets to Crosslike Nanoflowers to Nanobelts

Jiang

Pang

et al. 2006

J. Phys. Chem. B

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“…A variety of peroxomolybdates coordinated with oxygen and nitrogen donors have been characterized structurally, [21][22][23][24][25][26][27][28][29][30][31][32] and studied in solution and the solid state. [33][34][35][36][37][38][39] For good reasons hydroxycarboxylic acids are frequently used as active coordinating agents; they exist widely in biological media, and have been known to influence strategic metabolic pathways governing the physiological activities of cells and multicellular organisms. Indeed, some peroxomolybdates() carrying a hydroxycarboxylate ligand have been reported; they include monomeric citrate and glycolate complexes, K 43 Citrate ions are omnipresent small molecules in most plants and animal tissues where they regulate fundamental physiological processes, and are intermediates in carbohydrate metabolism, e.g.…”

Section: Introductionmentioning

confidence: 99%

Peroxomolybdate(vi)–citrate and –malate complex interconversions by pH-dependence. Synthetic, structural and spectroscopic studies

2004

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The reaction of potassium molybdate(VI) with biologically relevant ligands, citric and malic acids, in the presence of H2O2 was investigated for the effect of pH variations on the product pattern. That with citric acid led to the formation of the monomeric complex K4[MoO(O2)2(cit)].4H2O (1) in the pH range 7-9, and dimer K5[MoO(O2)(2-)(Hcit)H(Hcit)(O2)2OMo].6H2O (2) (H4cit = citric acid) at pH 3-6 through carboxylate-carboxylic acid hydrogen bonding. The relation with the previously identified K4[MoO3(cit)].2H2O (4) and K4[Mo2O5(Hcit)2].4H2O (5) were shown. These and other intermediates were shown to react in the pH range 3-6 to give a more stable species 2; the reaction sequence was demonstrated either by the protonation from 1 or the deprotonation of [MoO(O2)2(H2cit)](2-) (8). Evidence that 2 exists as a dimer in solution is presented. The reaction with (S)-malic acid afforded Delta-K(2n)[MoO(O2)2((S)-Hmal)]n.nH2O (3) (H3mal = malic acid) that was oxidized further to oxalato molybdate (11) by H2O2. The three complexes 1-3 were characterized by elemental analysis, UV, IR and NMR spectroscopies, in addition to the X-ray structural studies that show citrate and malate being coordinated as bidentate ligands via alpha-alkoxyl and alpha-carboxylate groups. The formation of these complexes is dictated by pH and their thermal stabilities varied with the coordinated hydroxycarboxylate ligands.

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“…Commun. 1986, 555-6.when molybdenum and tungsten powders are dissolved in cold 30% H2O2 97. Alkali metal salts of the diperoxo anions have been known for over 60 years, and early potentiometric and cryoscopic studies have confirmed the dimer formulation in solution.…”

mentioning

confidence: 99%

Peroxo and Superoxo Complexes of Chromium, Molybdenum, and Tungsten

Dickman¹,

Pope²

1994

Chem. Rev.

425

238

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First electrosynthesis of transition metal peroxo complexes. Synthesis, characterization and reactivity of molybdenum and tungsten heteroligand peroxo complexes

Cited by 20 publications

References 10 publications

Molybdenum Trioxide Nanostructures: The Evolution from Helical Nanosheets to Crosslike Nanoflowers to Nanobelts

Molybdenum Trioxide Nanostructures: The Evolution from Helical Nanosheets to Crosslike Nanoflowers to Nanobelts

Peroxomolybdate(vi)–citrate and –malate complex interconversions by pH-dependence. Synthetic, structural and spectroscopic studies

Peroxo and Superoxo Complexes of Chromium, Molybdenum, and Tungsten

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