Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†

Abstract The plasma-mediated decomposition of volatile organic compounds has previously been investigated in the gas phase with metal oxides as heterogeneous catalysts. While the reactive species in plasma itself are well investigated, very little is known about the influence of metal catalysts in s...

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Main Authors:	Dariusz Śmiłowicz, Friederike Kogelheide, Anna Lena Schöne, Katharina Stapelmann, Peter Awakowicz, Nils Metzler-Nolte
Format:	Article
Language:	English
Published:	Nature Publishing Group 2020-12-01
Series:	Scientific Reports
Online Access:	https://doi.org/10.1038/s41598-020-78683-7

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spelling	doaj-50034d9ca002418f95294199cf01fd2e2020-12-13T12:30:43ZengNature Publishing GroupScientific Reports2045-23222020-12-011011810.1038/s41598-020-78683-7Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†Dariusz Śmiłowicz0Friederike Kogelheide1Anna Lena Schöne2Katharina Stapelmann3Peter Awakowicz4Nils Metzler-Nolte5Inorganic Chemistry I – Bioinorganic Chemistry, Ruhr University BochumInstitute for Electrical Engineering and Plasma Technology, Ruhr University BochumInstitute for Electrical Engineering and Plasma Technology, Ruhr University BochumDepartment of Nuclear Engineering, North Carolina State UniversityInstitute for Electrical Engineering and Plasma Technology, Ruhr University BochumInorganic Chemistry I – Bioinorganic Chemistry, Ruhr University BochumAbstract The plasma-mediated decomposition of volatile organic compounds has previously been investigated in the gas phase with metal oxides as heterogeneous catalysts. While the reactive species in plasma itself are well investigated, very little is known about the influence of metal catalysts in solution. Here, we present initial investigations on the time-dependent plasma-supported oxidation of benzyl alcohol, benzaldehyde and phenol in the presence of molecular iron complexes in solution. Products were identified by HPLC, ESI-MS, FT-IR, and $$^{1}\hbox {H NMR}$$ 1 H NMR spectroscopy. Compared to metal-free oxidation of the substrates, which is caused by reactive oxygen species and leads to a mixture of products, the metal-mediated reactions lead to one product cleanly, and faster than in the metal-free reactions. Most noteworthy, even catalytic amounts of metal complexes induce these clean transformations. The findings described here bear important implications for plasma-supported industrial waste transformations, as well as for plasma-mediated applications in biomedicine, given the fact that iron is the most abundant redox-active metal in the human body.https://doi.org/10.1038/s41598-020-78683-7
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Dariusz Śmiłowicz Friederike Kogelheide Anna Lena Schöne Katharina Stapelmann Peter Awakowicz Nils Metzler-Nolte
spellingShingle	Dariusz Śmiłowicz Friederike Kogelheide Anna Lena Schöne Katharina Stapelmann Peter Awakowicz Nils Metzler-Nolte Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes† Scientific Reports
author_facet	Dariusz Śmiłowicz Friederike Kogelheide Anna Lena Schöne Katharina Stapelmann Peter Awakowicz Nils Metzler-Nolte
author_sort	Dariusz Śmiłowicz
title	Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†
title_short	Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†
title_full	Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†
title_fullStr	Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†
title_full_unstemmed	Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†
title_sort	catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†
publisher	Nature Publishing Group
series	Scientific Reports
issn	2045-2322
publishDate	2020-12-01
description	Abstract The plasma-mediated decomposition of volatile organic compounds has previously been investigated in the gas phase with metal oxides as heterogeneous catalysts. While the reactive species in plasma itself are well investigated, very little is known about the influence of metal catalysts in solution. Here, we present initial investigations on the time-dependent plasma-supported oxidation of benzyl alcohol, benzaldehyde and phenol in the presence of molecular iron complexes in solution. Products were identified by HPLC, ESI-MS, FT-IR, and $$^{1}\hbox {H NMR}$$ 1 H NMR spectroscopy. Compared to metal-free oxidation of the substrates, which is caused by reactive oxygen species and leads to a mixture of products, the metal-mediated reactions lead to one product cleanly, and faster than in the metal-free reactions. Most noteworthy, even catalytic amounts of metal complexes induce these clean transformations. The findings described here bear important implications for plasma-supported industrial waste transformations, as well as for plasma-mediated applications in biomedicine, given the fact that iron is the most abundant redox-active metal in the human body.
url	https://doi.org/10.1038/s41598-020-78683-7
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Catalytic oxidation of small organic molecules by cold plasma in solution in the presence of molecular iron complexes†

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