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Mangood AH, Gemeay AH, Abdel-Galeil MM, Salama ES, El-Shater RE. Evaluation of synergistic approach of spinel cadmium-copper nanoferrites as magnetic catalysts for promoting wastewater decontamination: Impact of Ag ions doping. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:106876-106893. [PMID: 37145354 PMCID: PMC10611890 DOI: 10.1007/s11356-023-27170-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 04/18/2023] [Indexed: 05/06/2023]
Abstract
Metal substitution is an efficient strategy to improve the catalytic activity of ferrite-based catalysts. In this study, Cd0.5Cu0.5-xAgxFe2O4 (where 0 ≤ x ≤ 0.5) ferrites were fabricated via a simple co-precipitation method. The influence of the silver ions on the structural, magnetic, and catalytic characteristics of the spinel nanoparticles, as well as on their morphology, was examined. X-ray diffractograms revealed a crystalline cubic spinel structure with crystallite sizes in the nanoregime (7-15 nm). The saturation magnetization reduced from 29.8 to 2.80 emu as the Ag+ doping increased. Two prominent absorption bands were visible in Fourier-transform infrared spectra at 600 cm-1 and 400 cm-1, respectively, and they belonged to the tetrahedral (A) and octahedral (B) sites. The samples were then used as catalysts for the oxidative breakdown of the typical organic contaminant indigo carmine dye (IC). The catalytic process followed the first-order kinetic model, and the rate constant increased from 0.007 to 0.023 min-1 with increasing of Ag+ doping. Cd0.5Cu0.5-xAgxFe2O4 exhibited excellent catalytic performance in the pH range of 2-11, which means that they are promising efficient and stable materials for Fenton-based alkaline wastewater treatment. Finally, the pathway includes, HO•, HO2-•, and O2-• as oxidants resulted from the synergistic effects of Fe3+, Cu2+, and Ag+, with H2O2 and surface hydroxyl groups have been proposed.
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Affiliation(s)
- Ahmed H Mangood
- Chemistry Department, Faculty of Science, Menofia University, Shabien Elkom, Egypt
| | - Ali H Gemeay
- Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt.
| | | | - Eman Sh Salama
- Chemistry Department, Faculty of Science, Menofia University, Shabien Elkom, Egypt
| | - Reda E El-Shater
- Physics Department, Faculty of Science, Tanta University, Tanta, Egypt
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Westbrook BR, Dreux KM, Tschumper GS, Francisco JS, Fortenberry RC. Binding of the atomic cations hydrogen through argon to water and hydrogen sulfide. Phys Chem Chem Phys 2018; 20:25967-25973. [DOI: 10.1039/c8cp05378b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water and hydrogen sulfide will bind with every atomic cation from the first three rows of the periodic table.
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Affiliation(s)
| | - Katelyn M. Dreux
- Department of Chemistry and Biochemistry
- University of Mississippi
- USA
| | | | - Joseph S. Francisco
- Department of Earth and Environmental Science Philadelphia
- University of Pennsylvania
- USA
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Sazegar MR, Dadvand A, Mahmoudi A. Novel protonated Fe-containing mesoporous silica nanoparticle catalyst: excellent performance cyclohexane oxidation. RSC Adv 2017. [DOI: 10.1039/c7ra02280h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
H/Fe-MSN exhibited high activity for the oxidation of cyclohexane to cyclohexanone in the presence of hydrogen peroxide at 298 K for about 1 h, giving a 97% yield.
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Affiliation(s)
| | - Aysan Dadvand
- Dept. of Chemistry
- Fac. of Science
- North Tehran Branch
- Islamic Azad University
- Tehran
| | - Ali Mahmoudi
- Dept. of Chemistry
- Fac. of Science
- North Tehran Branch
- Islamic Azad University
- Tehran
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Guajardo N, Carlesi C, Schrebler R, Morales J. Applications of Liquid/Liquid Biphasic Oxidations by Hydrogen Peroxide with Ionic Liquids or Deep Eutectic Solvents. Chempluschem 2016; 82:165-176. [PMID: 31961556 DOI: 10.1002/cplu.201600594] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Indexed: 11/09/2022]
Abstract
This Minireview focuses on recent applications of ionic liquids (ILs) and deep eutectic solvents (DESs) in biphasic oxidations in which the oxidizing agent corresponds to hydrogen peroxide. Biphasic reactions are accomplished when the substrate presents low or moderate solubility in aqueous (polar) systems and/or when separation of products and byproduct is an issue. The properties of the IL and DES allows the reaction activity to be intensified. On the other hand, the high chemical stability of the ionic solvents allows the use of hydrogen peroxide to minimize solvent degradation and unwanted byproducts. The experimental evidence presented herein shows that ILs and DESs can be used as cocatalysts, catalysts, and solvents to achieve enhanced yields and conversions. The process advantages, in terms of a reduction of volatile solvents, improve the safety and use of the oxidizing agent, which implies the possibility of developing new process improvements in the future.
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Affiliation(s)
- Nadia Guajardo
- Centro de Desarrollo y Transferencia Tecnológica (CEDYTEC), Facultad de Ingeniería, Ciencias y Tecnología, Universidad Bernardo O'Higgins, Avda. Viel, 1497, Santiago, Chile.,IONCHEM Ltda, Avda. Diego Portales 925, 301, Viña del Mar, Chile
| | - Carlos Carlesi
- Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Avda. Brasil, 2162, Valparaíso, Chile
| | | | - Jaime Morales
- Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Avda. Brasil, 2162, Valparaíso, Chile
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Ferreira de Paula FG, Berllini L, da Silva MJ. A novel Fe(III) salt-catalyzed monoterpene aerobic oxidation in methyl alcohol. CATAL COMMUN 2013. [DOI: 10.1016/j.catcom.2013.08.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Filimonova NB, Vorob’ev AV, Bozhenko KV, Moiseeva NI, Dolin SP, Gekhman AE, Moiseev II. A quantum-chemical study of the oxidation of ethylene by peroxyacetic acid derivatives. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2010. [DOI: 10.1134/s1990793110020089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Markov AA, Dolin SP, Moiseeva NI, Gekhman AE, Moiseev II. Catalytic peroxide oxidation: The structure of key intermediates in the VV/H2O2 system according to quantum chemical data. KINETICS AND CATALYSIS 2009. [DOI: 10.1134/s0023158409050061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Silva TFS, Mishra GS, Guedes da Silva MF, Wanke R, Martins LMDRS, Pombeiro AJL. CuII complexes bearing the 2,2,2-tris(1-pyrazolyl)ethanol or 2,2,2-tris(1-pyrazolyl)ethyl methanesulfonate scorpionates. X-Ray structural characterization and application in the mild catalytic peroxidative oxidation of cyclohexane. Dalton Trans 2009:9207-15. [DOI: 10.1039/b911990f] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yoshimoto M, Miyazaki Y, Umemoto A, Walde P, Kuboi R, Nakao K. Phosphatidylcholine vesicle-mediated decomposition of hydrogen peroxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:9416-22. [PMID: 17655340 DOI: 10.1021/la701277f] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The decomposition of hydrogen peroxide (H2O2) was examined in aqueous solution (50 mM Tris-HCl buffer, pH 7.4, containing 100 mM NaCl) at 25 degrees C in pure buffer or in the presence of either vesicles or micelles formed from various phosphatidylcholines (PCs). In the absence of PCs, more than 90% of the initially added H2O2 (1.0 mM) remained intact after incubation for 120 h. The effect of the PCs on the decomposition of H2O2 was studied by using different PCs that varied in terms of number of carbon atoms in the two acyl chains n as well as in terms of the degree of unsaturation. PCs with short hydrocarbon chains (n = 4, 6-8) were dissolved in the buffer solution in the form of nonassociated monomers or as micelles in equilibrium with monomers at a fixed PC concentration of 10 mM. The presence of these short-chain PCs slightly enhanced the H2O2 decomposition rate. Micelles formed by non-lipid detergents (sodium cholate, Triton X-100, and sodium dodecylsulfate) had a similar effect. In marked contrast, PCs with long hydrocarbon chains (n > or = 10) dispersed in buffer solution as vesicles (liposomes) significantly enhanced the rate of H2O2 decomposition, with the most effective PC being 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) at 25 degrees C. This indicates that the packing density of the PC molecules influences the reactivity, presumably through the direct interaction of the PC assemblies with H2O2 molecules. Furthermore, in the case of vesicles formed from PCs with unsaturated acyl chains (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, POPC; 1,2-dioleoyl-sn-glycero-3-phosphocholine, DOPC), carbon-carbon double bond oxidation did not occur extensively under the conditions used. This indicates that the observed effect of PCs on the decomposition of H2O2 is indeed related to the assembly structure (vesicle vs micelles vs monomers) and is clearly not related to the presence of unsaturated hydrocarbon chains. Fluorescence polarization measurements of two fluorescent probes embedded either in the acyl chain region of the vesicles (DPH, 1,6-diphenyl-1,3,5-hexatriene) or on the surface of the vesicles (TMA-DPH, 1-(4-trimethylammoniumphenyl)-6-phenyl-1,3,5-hexatriene iodide) show that the presence of H2O2 leads to a decrease in the fluidity of the lipid-water surface and not to a change in the fluidity of the hydrophobic region of the vesicle bilayer. This indicates that the decomposition of H2O2 is triggered through interactions between H2O2 and the polar head group area of PC vesicles.
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Affiliation(s)
- Makoto Yoshimoto
- Department of Applied Molecular Bioscience, Yamaguchi University, Tokiwadai, Ube, Japan.
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Potekhin VV. Kinetics and mechanism of catalytic oxidation of alcohols to carbonyl compounds with dioxygen in the Pd-containing aqua system. Russ Chem Bull 2007. [DOI: 10.1007/s11172-007-0132-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Yudanov IV. Mechanism of olefin epoxidation with transition metal peroxo complexes: DFT study. J STRUCT CHEM+ 2007. [DOI: 10.1007/s10947-007-0154-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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e Silva JMDS, Vinhado FS, Mandelli D, Schuchardt U, Rinaldi R. The chemical reactivity of some terpenes investigated by alumina catalyzed epoxidation with hydrogen peroxide and by DFT calculations. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2006.02.042] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Potekhin VV, Solov’eva SN, Potekhin VM. Catalytic oxidation of Fe(II) aqua ions with atmospheric oxygen in the presence of Pd(II) tetraaqua complex and an aromatic compound. RUSS J GEN CHEM+ 2006. [DOI: 10.1134/s1070363206050057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Gao L, Jiang T, Han B, Zong B, Zhang X, Zhang J. Influence of Compressed Carbon Dioxide on the Oxidation of Cyclohexane with Hydrogen Peroxide in Acetic Acid. Aust J Chem 2006. [DOI: 10.1071/ch05331] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The oxidation of cyclohexane with H2O2 in a compressed CO2/acetic acid binary system was studied at 60.0 and 80.0°C, at pressures up to 18 MPa, and with the zeolite TS-1 as catalyst. The phase behaviour of the reaction system was also observed. There are three fluid phases in the reaction system at lower pressure but two at higher pressures. In the three-phase region the yields of the products, cyclohexanol and cyclohexanone, increase considerably with increasing pressure and reaches a maximum near the phase-separating pressure. CO2 can thus enhance the reaction effectively. However, the effect of pressure on the yield is very limited after the transition to a two-phase system.
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Zubarev DY, Filimonova NB, Timokhina EN, Bozhenko KV, Moiseeva NI, Nefedov SE, Dolin SP, Gekhman AE, Moiseev II. The Role of Multicenter Hydrogen Bonds in Peracetic Acid Isomerization to the Corresponding Dioxirane. DOKLADY PHYSICAL CHEMISTRY 2005. [DOI: 10.1007/s10634-005-0064-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Tautomerism of peroxyacetic acid derivatives: a quantum chemical study. Russ Chem Bull 2005. [DOI: 10.1007/s11172-006-0074-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Kinetics and mechanism of hydrogen peroxide decomposition in the presence of the tetraaquapalladium(II) complex. Russ Chem Bull 2005. [DOI: 10.1007/s11172-005-0365-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Sennikov PG, Ignatov SK, Schrems O. Complexes and Clusters of Water Relevant to Atmospheric Chemistry: H2O Complexes with Oxidants. Chemphyschem 2005; 6:392-412. [PMID: 15799459 DOI: 10.1002/cphc.200400405] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Experimental observations and data from quantum chemical calculations on complexes between water molecules and small, oxygen-containing inorganic species that play an important role as oxidants in the atmosphere (O(1D), O(3P), O2(X3sigmag), O2(b1sigmag+), O3, HO, HOO, HOOO, and H2O2) are reviewed, with emphasis on their structure, hydrogen bonding, interaction energies, thermodynamic parameters, and infrared spectra. In recent years, weakly bound complexes containing water have increasingly attracted scientific attention. Water in all its phases is a major player in the absorption of solar and terrestrial radiation. Thus, complexes between water and other atmospheric species may have a perceivable influence on the radiative balance and contribute to the greenhouse effect, even though their concentrations are low. In addition, they can play an important role in the chemistry of the Earth's atmosphere, particularly in the oxidation of trace gases. Apart from gas-phase complexes, the interactions of oxidants with ice surfaces have also received considerable advertency lately due to their importance in the chemistry of snow, ice clouds, and ice surfaces (e.g., ice shields in polar regions). In paleoclimate--respectively paleoenvironmental--studies, it is essential to understand the transfer processes from the atmosphere to the ice surface. Consequently, special attention is being paid here to the intercomparison of the properties of binary complexes and the complexes and clusters of more complicated compositions, including oxidants adsorbed on ice surfaces, where ice is considered a kind of large water cluster. Various facts concerning the chemistry of the Earth's atmosphere (concentration profiles and possible influence on radical reactions in the atmosphere) are discussed.
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Affiliation(s)
- Petr G Sennikov
- Institute of Chemistry of High Purity Substances RAS Tropinin str. 49, 603950 Nizhny Novgorod, Russia
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Gekhman AE, Stolyarov IP, Moiseeva NI, Moiseev II. Hydroperoxide oxidation: unexpected C–C bond cleavage in branched alkanes and oxidation of molecular nitrogen. CR CHIM 2004. [DOI: 10.1016/j.crci.2004.06.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Cr2O3/ZrO2 catalysts for CO2 dehydrogenation of ethane to ethylene. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0167-2991(04)80133-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
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Aparicio F, Contreras R, Galván M, Cedillo A. Global and Local Reactivity and Activation Patterns of HOOX (X = H, NO2, CO2-, SO3-) Peroxides with Solvent Effects. J Phys Chem A 2003. [DOI: 10.1021/jp034936g] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Felipe Aparicio
- Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Iztapalapa, A.P. 55-534, México D. F. 09340, México, and Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
| | - Renato Contreras
- Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Iztapalapa, A.P. 55-534, México D. F. 09340, México, and Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
| | - Marcelo Galván
- Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Iztapalapa, A.P. 55-534, México D. F. 09340, México, and Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
| | - Andrés Cedillo
- Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Iztapalapa, A.P. 55-534, México D. F. 09340, México, and Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
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Kinetics and mechanism of the heterogeneous catalyzed oxidative degradation of indigo carmine. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1169(02)00477-6] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Cerium complexes with acetato acylbis(pyrazolinone) ligands as an efficient catalyst for the oxidation of cresols by molecular oxygen. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1381-1169(02)00053-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Okajima T. Ab initio MO study on the solvent effect for hydrogen shift from hydrogen peroxide (H 2 O 2 ) to water oxide (O–OH 2 ). ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0166-1280(01)00551-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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de Bruin B, Verhagen JA, Schouten CH, Gal AW, Feichtinger D, Plattner DA. Enhanced reactivity of 2-rhodaoxetanes through a labile acetonitrile ligand. Chemistry 2001; 7:416-22. [PMID: 11271528 DOI: 10.1002/1521-3765(20010119)7:2<416::aid-chem416>3.0.co;2-q] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
New cationic, square-planar, ethene complexes [(Rbpa)RhI(C2H4)]+ [2a]--[2c]+ (Rbpa = N-alkyl-N,N-di(2-pyridylmethyl)amine; [2a]+: alkyl =R=Me; [2b]+: R = Bu; [2c]+: R = Bz) have been selectively oxygenated in acetonitrile by aqueous hydrogen peroxide to 2-rhoda(III)oxetanes with a labile acetonitrile ligand, [(Rbpa)RhIII(kappa2-C,O-CH2CH2O-)(MeCN)]+, [3a]+-[3c]+. The rate of elimination of acetaldehyde from [(Rbpa)RhIII(kappa2-C,O-CH2CH2O-)(MeCN)]+ increases in the order R = Me< R = Bu< R = Bz. Elimination of acetaldehyde from [(Bzbpa)RhIII(kappa2-C,O-CH2CH2O)(MeCN)]+ [3c]+, in the presence of ethene results in regeneration of ethene complex [(Bzbpa)RhI(C2H4)]+ [2c]+, and closes a catalytic cycle. In the presence of Z,Z-1,5-cyclooctadiene (cod) the corresponding cod complex [(Bzbpa)RhI(cod)]+ [6c]+ is formed. Further oxidation of [3c]+ by H2O2 results in the transient formylmethyl-hydroxy complex [(Bzbpa)RhIII(OH)[kappa1-C-CH2C(O)H]]+ [5c]+.
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Affiliation(s)
- B de Bruin
- Department of Inorganic Chemistry, University of Nijmegen, The Netherlands
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Okajima T. Theoretical study on the influence of H2O for the 1,2-hydrogen shift from hydrogen peroxide (H2O2) to water oxide (O-OH2). CAN J CHEM 2001. [DOI: 10.1139/v00-161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Theoretical calculation was performed to study the solvent effect for the 1,2-hydrogen shift from hydrogen peroxide (H2O2) (1) to water oxide (O-OH2) (2). Stationary points including transition structures (TSs) were optimized with no geometrical constraint at Becke3LYP/6-311++G** level. All stationary points were tested by frequency analysis and IRC calculation. The activation energies (ΔE[Formula: see text]) and heats of reaction (ΔH0) were evaluated at Becke3LYP/6-311++G**//Becke3LYP/6-311++G** level of theory. The following points were clarified: (i) inclusion of polarization function (*) and diffusion function (+) for calculation hardly affected the energetic of the reaction; (ii) judging from the change of ΔE[Formula: see text] and ΔH0 values, the reaction is predicted to be accelerated by the increase of involving H2O; (iii) proton-relaying mechanism considerably reduced ΔE[Formula: see text] values; (iv) the endothermicity became monotonically small as the number of solvating H2O molecules increased. The calculation suggests that the formation of water oxide (O-OH2) (2) from H2O2 (1) is promoted by a proton-relaying pathway in protic media (such as H2O).Key words: theoretical calculation, ab initio, transition structure, 1,2-hydrogen shift, water oxide.
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Aqueous Phase Oxidation of Methane with Hydrogen Peroxide Catalyzed by Di-iron-Substituted Silicotungstate. J Catal 1999. [DOI: 10.1006/jcat.1999.2455] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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