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Article Dans Une Revue Analytical Chemistry Année : 2010

Tholinomics-chemical analysis of nitrogen-rich polymers

Pascal Pernot
Nathalie Carrasco
Roland Thissen

Résumé

The polymeric composition of Titan's tholinsslaboratory analogues of Titan's aerosolssis elucidated using highresolution mass spectrometry. This complex organic matter is produced by plasma discharge in a gaseous nitrogen-methane mixture and analyzed with a hybrid linear trap/orbitrap mass-spectrometer. The highly structured mass spectra are treated with tools developed for petroleomics (Kendrick and van Krevelen diagrams), with original adaptations for nitrogen-rich compounds. Our goal is to find the best chemical basis set to describe the compositional space that these polymers occupy, to shed light onto the chemical structure of tholins. We succeeded in assigning the molecules identified in the mass spectra of tholins to a small number of regularly distributed X-(CH2)m(HCN)n families, where the balanced copolymer (m) n) is determined to play a central role. Within each family, the polymer lengths n and m present Poisson-type distributions. We also identify the smallest species of a subset of families as linear and cyclic amino nitrile compounds of great astrobiological interest: biguanide, guanidin, acetamidine, aminoacetonitrile, and methylimidazole.
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Dates et versions

hal-00464271 , version 1 (26-08-2022)

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Pascal Pernot, Nathalie Carrasco, Roland Thissen, Isabelle Schmitz-Afonso. Tholinomics-chemical analysis of nitrogen-rich polymers. Analytical Chemistry, 2010, 82 (4), pp.1371-1380. ⟨10.1021/ac902458q⟩. ⟨hal-00464271⟩
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