The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen
In this work, the kinetics of the redox reaction between platinum(IV) chloride complex ions and ascorbic acid is studied. The reduction process of Pt(IV) to Pt(II) ions was carried out at different reagent concentrations and environmental conditions, i.e., pH (2.2–5.1), temperature (20–40 °C), ionic...
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2023-06-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/13/4630 |
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| author | Magdalena Luty-Błocho Aleksandra Szot Volker Hessel Krzysztof Fitzner |
| author_facet | Magdalena Luty-Błocho Aleksandra Szot Volker Hessel Krzysztof Fitzner |
| author_sort | Magdalena Luty-Błocho |
| collection | DOAJ |
| description | In this work, the kinetics of the redox reaction between platinum(IV) chloride complex ions and ascorbic acid is studied. The reduction process of Pt(IV) to Pt(II) ions was carried out at different reagent concentrations and environmental conditions, i.e., pH (2.2–5.1), temperature (20–40 °C), ionic strength (I = 0.00–0.40 M) and concentrations of chloride ions (0.00–0.40 M). The kinetic traces during the reduction process were registered using stopped-flow spectrophotometry. Based on the kinetic traces, the rate constants were determined, and the kinetic equations were proposed. It was shown that in the mild acidic medium (pH = 2.5), the reduction process of Pt(IV) to Pt(II) ions is more complex in the presence of oxygen dissolved in the aqueous solutions. For these processes, the values of the enthalpy and entropy of activation were determined. Moreover, the mechanism of the reduction of Pt(IV) to Pt(II) ions was proposed. The presented results give an overview of the process of the synthesis of platinum nanoparticles in the solution containing oxygen, in which the reduction process of Pt(IV) to Pt(II) ions is the first step. |
| first_indexed | 2024-03-11T01:36:32Z |
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| id | doaj.art-c99949f494e5462ebe847d83b25f741d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T01:36:32Z |
| publishDate | 2023-06-01 |
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| record_format | Article |
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| spelling | doaj.art-c99949f494e5462ebe847d83b25f741d2023-11-18T16:57:37ZengMDPI AGMaterials1996-19442023-06-011613463010.3390/ma16134630The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of OxygenMagdalena Luty-Błocho0Aleksandra Szot1Volker Hessel2Krzysztof Fitzner3Faculty of Non-Ferrous Metals, AGH University of Krakow, al. Adama Mickiewicza 30, 30-059 Kraków, PolandFaculty of Non-Ferrous Metals, AGH University of Krakow, al. Adama Mickiewicza 30, 30-059 Kraków, PolandSchool of Chemical Engineering, The University of Adelaide, Adelaide 5005, AustraliaFaculty of Non-Ferrous Metals, AGH University of Krakow, al. Adama Mickiewicza 30, 30-059 Kraków, PolandIn this work, the kinetics of the redox reaction between platinum(IV) chloride complex ions and ascorbic acid is studied. The reduction process of Pt(IV) to Pt(II) ions was carried out at different reagent concentrations and environmental conditions, i.e., pH (2.2–5.1), temperature (20–40 °C), ionic strength (I = 0.00–0.40 M) and concentrations of chloride ions (0.00–0.40 M). The kinetic traces during the reduction process were registered using stopped-flow spectrophotometry. Based on the kinetic traces, the rate constants were determined, and the kinetic equations were proposed. It was shown that in the mild acidic medium (pH = 2.5), the reduction process of Pt(IV) to Pt(II) ions is more complex in the presence of oxygen dissolved in the aqueous solutions. For these processes, the values of the enthalpy and entropy of activation were determined. Moreover, the mechanism of the reduction of Pt(IV) to Pt(II) ions was proposed. The presented results give an overview of the process of the synthesis of platinum nanoparticles in the solution containing oxygen, in which the reduction process of Pt(IV) to Pt(II) ions is the first step.https://www.mdpi.com/1996-1944/16/13/4630redox reactionPt(IV) ionskinetic rate constantphotolysisstopped-flow spectrophotometry |
| spellingShingle | Magdalena Luty-Błocho Aleksandra Szot Volker Hessel Krzysztof Fitzner The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen Materials redox reaction Pt(IV) ions kinetic rate constant photolysis stopped-flow spectrophotometry |
| title | The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen |
| title_full | The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen |
| title_fullStr | The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen |
| title_full_unstemmed | The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen |
| title_short | The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen |
| title_sort | kinetics of the redox reaction of platinum iv ions with ascorbic acid in the presence of oxygen |
| topic | redox reaction Pt(IV) ions kinetic rate constant photolysis stopped-flow spectrophotometry |
| url | https://www.mdpi.com/1996-1944/16/13/4630 |
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