Kinetics and mechanism of the oxidation of tris(4,7-dihydroxy-1,10-phenanthroline)-iron(II) by molecular oxygen

1980 ◽  
Vol 58 (17) ◽  
pp. 1773-1779 ◽  
Author(s):  
Flora T. T. Ng ◽  
Patrick M. Henry
Keyword(s):  
Electron Transfer ◽  
Molecular Oxygen ◽  
Reactive Species ◽  
Kinetics And Mechanism ◽  
Ph Profile ◽  
Rate Law ◽  
Notable Feature ◽  
Wide Range ◽  
Naoh Solution ◽  
Plausible Mechanism

The reaction of (OHP)3Fe(II) (OHP = 4,7-dihydroxy-1,10-phenanthroline) with oxygen in aqueous 0.1 N NaOH solution takes place according to the stoichiometry:[Formula: see text]This stoichiometry holds whether (OHP)3Fe(II) or O2 is in excess. The rate law over a wide range of (OHP)3Fe(II) and O2 concentrations at 0.1 N NaOH has the form:[Formula: see text]A notable feature of this oxidation is that free HO2− is not produced as an intermediate. A plausible mechanism involving bound superoxide or peroxide as intermediates is proposed. Due to the redox nature of the OHP ligand and the low potenial of the (OHP)3Fe(II) complex, a 4 electron transfer from one (OHP)3Fe(II) to one O2 to give a Fe(IV) species with an oxidized ligand is a distinct possibility. The rate–pH profile is consistent with the protonation of (OHP)3Fe(II) (pKa ≈ 9.4) to give a more reactive species.

scholarly journals The kinetics and mechanism of oxidation of reduced phosphovanadomolybdates by molecular oxygen: theory and experiment in concert

2018 ◽  
Vol 20 (11) ◽  
pp. 7579-7587 ◽  
Author(s):  
Alexander M. Khenkin ◽  
Irena Efremenko ◽  
Jan M. L. Martin ◽  
Ronny Neumann
Keyword(s):  
Electron Transfer ◽  
Molecular Oxygen ◽  
Oxygen Transfer ◽  
Kinetics And Mechanism ◽  
Transfer Reactions ◽  
Inner Sphere ◽  
Mechanism Of Oxidation ◽  
Theory And Experiment

The reaction of molecular oxygen with a polyoxometalate catalyst used for electron transfer–oxygen transfer reactions shows an inner sphere process.

Fe(NO3)3·9H2O-catalyzed aerobic oxidative deoximation of ketoximes and aldoximes under mild conditions

2018 ◽  
Vol 96 (8) ◽  
pp. 810-814 ◽  
Author(s):  
Yongshu Li ◽  
Nizhou Xu ◽  
Guangyao Mei ◽  
Yun Zhao ◽  
Yiyong Zhao ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Functional Groups ◽  
Environmentally Benign ◽  
Synthetic Method ◽  
Simple Process ◽  
Practical Applications ◽  
Mild Conditions ◽  
Excellent Yield ◽  
Wide Range ◽  
Plausible Mechanism

A mild, simple process for the effective aerobic oxidative deoximation of a wide range of ketoximes and aldoximes has been developed that utilizes Fe(NO3)3·9H2O as the single catalyst and molecular oxygen as the green oxidant. The environmentally benign protocol provides moderate to excellent yield and broad functional groups tolerance and is a valuable synthetic method for practical applications. According the relevant verification experiment, a plausible mechanism has been proposed.

scholarly journals RuIII(edta) complexes as molecular redox catalysts in chemical and electrochemical reduction of dioxygen and hydrogen peroxide: inner-sphere versus outer-sphere mechanism

RSC Advances ◽  
2021 ◽  
Vol 11 (35) ◽  
pp. 21359-21366
Author(s):  
Debabrata Chatterjee ◽  
Marta Chrzanowska ◽  
Anna Katafias ◽  
Maria Oszajca ◽  
Rudi van Eldik
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Transfer ◽  
Electrochemical Reduction ◽  
Molecular Oxygen ◽  
Outer Sphere ◽  
Transfer Processes ◽  
Edta Complexes ◽  
Inner Sphere ◽  
Electron Transfer Processes ◽  
Sphere Mechanism

[RuII(edta)(L)]2–, where edta4– =ethylenediaminetetraacetate; L = pyrazine (pz) and H2O, can reduce molecular oxygen sequentially to hydrogen peroxide and further to water by involving both outer-sphere and inner-sphere electron transfer processes.

scholarly journals The Role of the Reactive Species Involved in the Photocatalytic Degradation of HDPE Microplastics Using C,N-TiO2 Powders

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 999 ◽  
Author(s):  
Aranza Denisse Vital-Grappin ◽  
Maria Camila Ariza-Tarazona ◽  
Valeria Montserrat Luna-Hernández ◽  
Juan Francisco Villarreal-Chiu ◽  
Juan Manuel Hernández-López ◽  
...  
Keyword(s):  
Wastewater Treatment Plants ◽  
Reaction System ◽  
Terrestrial Ecosystems ◽  
Degradation Process ◽  
Reactive Species ◽  
Hazardous Substances ◽  
Wide Range ◽  
Degradation Behaviors ◽  
Environmentally Friendly Process

Microplastics (MPs) are distributed in a wide range of aquatic and terrestrial ecosystems throughout the planet. They are known to adsorb hazardous substances and can transfer them across the trophic web. To eliminate MPs pollution in an environmentally friendly process, we propose using a photocatalytic process that can easily be implemented in wastewater treatment plants (WWTPs). As photocatalysis involves the formation of reactive species such as holes (h+), electrons (e−), hydroxyl (OH●), and superoxide ion (O2●−) radicals, it is imperative to determine the role of those species in the degradation process to design an effective photocatalytic system. However, for MPs, this information is limited in the literature. Therefore, we present such reactive species’ role in the degradation of high-density polyethylene (HDPE) MPs using C,N-TiO2. Tert-butanol, isopropyl alcohol (IPA), Tiron, and Cu(NO3)2 were confirmed as adequate OH●, h+, O2●− and e− scavengers. These results revealed for the first time that the formation of free OH● through the pathways involving the photogenerated e− plays an essential role in the MPs’ degradation. Furthermore, the degradation behaviors observed when h+ and O2●− were removed from the reaction system suggest that these species can also perform the initiating step of degradation.

scholarly journals Kinetics and Mechanism of Ruthenium(III) Chloride Catalyzed Oxidation of Propane-1,3-diol by Thallium(III) in Acid Perchlorate Medium

1999 ◽  
Vol 23 (1) ◽  
pp. 1-1
Author(s):  
Menka Bhasin ◽  
Indu Sharma ◽  
P. D. Sharma
Keyword(s):  
Electron Transfer ◽  
Kinetics And Mechanism ◽  
Hydride Ion ◽  
Catalyzed Oxidation

The mode of electron transfer in ruthenium(III) chloride catalyzed oxidation of propane-1,3-diol by thallium(III) is explained by hydride ion abstraction.

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