Abstract
A mixture of iron carbides and fullerene C60 formed by electric arc synthesis has been hydroxylated by adding OH groups to the fullerene surface, which made it possible, according to the EXAFS data, to obtain almost pure fullerenol Fe@C60(OH)30. Powder samples of the fullerenol and the product obtained after its dehydroxylation have been examined using Mössbauer spectroscopy. The Mössbauer spectra have been processed under the assumption of superposition of three partial doublets of spectral lines. It is established that two doublets due to Fe3+ dominate in the fullerenol spectrum. For the reduced fullerene Fe@C60 sample, two doublets are due to Fe3+ and the Fe2+ doublet dominates. Thus, attachment of OH groups from the outer side of the fullerene carbon frame increases the oxidation state of iron, which shows that the iron atom is located inside the frame.
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Funding
This study was supported by the Russian Foundation for Basic Research, project nos. 18-29-12081mk in the part of the Mössbauer measurements (45%) and no. 18-29-19008mk in the part of the synthesis, certification, and X-ray diffraction and EXAFS measurements (45%). The analysis of the Mössbauer spectra was performed under the State assignment of the Ministry of Science and Higher Education of the Russian Federation for the Valiev Institute of Physics and Technology, Russian Academy of Sciences, topic no. 0066-2019-0004 (10%).
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Translated by E. Bondareva
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Cherepanov, V.M., Lebedev, V.T., Borisenkova, A.A. et al. Valence and Coordination of Iron with Carbon in Structures Based on Fullerene С60 according to NGR Spectroscopy and EXAFS. Crystallogr. Rep. 65, 404–408 (2020). https://doi.org/10.1134/S1063774520030086
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DOI: https://doi.org/10.1134/S1063774520030086