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Article dans une revue

Previously unknown class of metalorganic compounds revealed in meteorites

Abstract : The rich diversity and complexity of organic matter found in meteorites is rapidly expanding our knowledge and understanding of extreme environments from which the early solar system emerged and evolved. Here, we report the discovery of a hitherto unknown chemical class, dihydroxymagnesium carboxylates [(OH)(2)MgO2CR](-), in meteoritic soluble organic matter. High collision energies, which are required for fragmentation, suggest substantial thermal stability of these Mg-metalorganics (CHOMg compounds). This was corroborated by their higher abundance in thermally processed meteorites. CHOMg compounds were found to be present in a set of 61 meteorites of diverse petrological classes. The appearance of this CHOMg chemical class extends the previously investigated, diverse set of CHNOS molecules. A connection between the evolution of organic compounds and minerals is made, as Mg released from minerals gets trapped into organic compounds. These CHOMg metalorganic compounds and their relation to thermal processing in meteorites might shed new light on our understanding of carbon speciation at a molecular level in meteorite parent bodies.
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Soumis le : jeudi 8 juin 2017 - 11:51:48
Dernière modification le : vendredi 5 août 2022 - 15:05:12

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Alexander Ruf, Basem Kanawati, Norbert Hertkorn, Qing-Zhu Yin, Franco Moritz, et al.. Previously unknown class of metalorganic compounds revealed in meteorites. Proceedings of the National Academy of Sciences of the United States of America, National Academy of Sciences, 2017, 114 (11), pp.2819 - 2824. ⟨10.1073/pnas.1616019114⟩. ⟨hal-01534828⟩



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