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  The Dark Reaction of C60 and of C70 with Molecular Oxygen at Atmospheric Pressure and Temperatures between 300 K and 800 K

Wohlers, M., Bauer, A., Rühle, T., Neitzel, F., Werner, H., & Schlögl, R. (1997). The Dark Reaction of C60 and of C70 with Molecular Oxygen at Atmospheric Pressure and Temperatures between 300 K and 800 K. Fullerene Science and Technology, 5(1), 49-83. doi:10.1080/15363839708011973.

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 Creators:
Wohlers, Michael1, Author           
Bauer, Andrea1, Author           
Rühle, Thomas1, Author           
Neitzel, F.1, 2, Author           
Werner, Harald1, Author           
Schlögl, Robert1, Author           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Institut für Organische Chemie, Universität Mainz, ou_persistent22              

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 Abstract: The solid fullerenes C60 and C70 react in deliberate and adventitious situations with molecular oxygen in a wide range of temperatures. Using thin films and polycrystalline bulk samples with well-defined structures and chemical histories we investigated the complex process from molecular intercalation over atomic adduct formation to deep oxidation and polymerisation which together describe the oxidation reaction. A combination of photoemission (UPS, XPS) photoabsorption (XAS), FT-IR, temperature-programmed and isothermal gravimetric measurements and DSC allowed to identify the existence and gradual interconversion of the three types of solid products besides the gas phase products CO and CO2. Both fullerenes react along the same reaction path. The difference of the molecular structures results in different activation barriers in the initial step of intercalation and in the final step of cage-opening. The overall reactivity of both fiiHerenes is quite similar at temperatures above the gasification onset of 570 K. The formation of the various adduct compounds was found to exert a detectable influence upon the overall molecular shape of the fiiHerenes and a small effect on the electronic structure was observed. The only moderate differences in electronic and geometric structures of pristine and initially oxidised fullerenes precludes a pronounced molecule-by-molecule reaction control and allows the topochemistry of the intercalation to control the shape of the reaction interface. This control is less effective for C70 than for the C60 fullerene.

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Language(s): eng - English
 Dates: 1996-06-101997
 Publication Status: Published in print
 Pages: 35
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1080/15363839708011973
 Degree: -

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Title: Fullerene Science and Technology
  Other : Fullerene Sci. Technol.
Source Genre: Journal
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Publ. Info: New York, NY : Marcel Dekker
Pages: 35 Volume / Issue: 5 (1) Sequence Number: - Start / End Page: 49 - 83 Identifier: ISSN: 1064-122X
CoNE: https://pure.mpg.de/cone/journals/resource/111024950808008