Abstract
The γ radiolysis of fullerene C60 dispersed in H2O, H2O/NH3, H2O/methanol and H2O/NH3/methanol was studied at 250 and 500 kGy. It was found that C60 originally insoluble in the above mentioned hosting matrix became soluble as a consequence of multiple hydroxylation and oxidation reaction produced by the free radicals generated by the radiolysis of the hosting matrix. The changes undergone by C60 were studied by infrared spectroscopy (FT-IR) and by electronic absorption spectroscopy. The astrochemical consequences of the present study are that C60 ejected in the interstellar medium for instance from protoplanetary and planetary nebulae can condense together with water and other ices in dense molecular clouds. Under the action of high energy radiation C60 reacts with the free radicals generated from the matrix where it is embedded it is solubilized and consequently its carbon content becomes available for further abiotic processes of synthesis of molecules of astrobiological interest. The behavior of C60 appears comparable to that of common PAHs which are also hydroxylated and oxidized under similar conditions.
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Acknowledgments
The present research work has been supported by grant AYA2007-64748 Expte. NG-014-10 of the Spanish Ministerio de Ciencia e Innovacion. The National Center for Astronomy, KACST, Saudi Arabia is also gratefully acknowledged for a partial support of the present work.
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Iglesias-Groth, S., Hafez, Y., Angelini, G. et al. γ Radiolysis of C60 fullerene in water and water/ammonia mixtures: relevance of fullerene fate in ices of interstellar medium. J Radioanal Nucl Chem 298, 1073–1083 (2013). https://doi.org/10.1007/s10967-013-2484-0
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DOI: https://doi.org/10.1007/s10967-013-2484-0