Diradicaloids in the insoluble organic matter from the Tagish Lake meteorite: Comparison with the Orgueil and Murchison meteorites

Abstract— The radicals in the insoluble organic matter (IOM) from the Tagish Lake meteorite were studied by electron paramagnetic resonance and compared to those existing in the Orgueil and Murchison meteorites. As in the Orgueil and Murchison meteorites, the radicals in the Tagish Lake meteorite ar...

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Bibliographic Details
Published in:Meteoritics & Planetary Science
Main Authors: BINET, L., GOURIER, D., DERENNE, S., PIZZARELLO, S., BECKER, L.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2004
Subjects:
Murchison
Tagish
Tagish Lake
Online Access:http://dx.doi.org/10.1111/j.1945-5100.2004.tb00064.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.2004.tb00064.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.2004.tb00064.x
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Summary:Abstract— The radicals in the insoluble organic matter (IOM) from the Tagish Lake meteorite were studied by electron paramagnetic resonance and compared to those existing in the Orgueil and Murchison meteorites. As in the Orgueil and Murchison meteorites, the radicals in the Tagish Lake meteorite are heterogeneously distributed and comprise a substantial amount (˜42%) of species with a thermally accessible triplet state and with the same singlet‐triplet gap, ΔE ≅0.1 eV, as in the Orgueil and Murchison meteorites. These species were identified as diradicaloid moieties. The existence of similar diradicaloid moieties in three different carbonaceous chondrites but not in terrestrial IOM strongly suggests that these moieties could be “fingerprints” of the extraterrestrial origin of meteoritic IOM and markers of its synthetic pathway before its inclusion into a parent body.

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