FERUS, Martin, Svatopluk CIVIS, Arnošt MLÁDEK, Jiří ŠPONER, Libor JUHA a Judit ŠPONEROVÁ. On the Road from Formamide Ices to Nucleobases: IR-Spectroscopic Observation of a Direct Reaction between Cyano Radicals and Formamide in a High-Energy Impact Event. Journal of the American Chemical Society. WASHINGTON: American Chemical Society, 2012, roč. 134, č. 51, s. 20788-20796. ISSN 0002-7863. doi:10.1021/ja310421z.
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Základní údaje
Originální název On the Road from Formamide Ices to Nucleobases: IR-Spectroscopic Observation of a Direct Reaction between Cyano Radicals and Formamide in a High-Energy Impact Event
Autoři FERUS, Martin (203 Česká republika), Svatopluk CIVIS (203 Česká republika), Arnošt MLÁDEK (203 Česká republika, domácí), Jiří ŠPONER (203 Česká republika, garant, domácí), Libor JUHA (203 Česká republika) a Judit ŠPONEROVÁ (348 Maďarsko, domácí).
Vydání Journal of the American Chemical Society, WASHINGTON, American Chemical Society, 2012, 0002-7863.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor 10610 Biophysics
Stát vydavatele Spojené státy
Utajení není předmětem státního či obchodního tajemství
WWW URL
Impakt faktor Impact factor: 10.677
Kód RIV RIV/00216224:14740/12:00063768
Organizační jednotka Středoevropský technologický institut
Doi http://dx.doi.org/10.1021/ja310421z
UT WoS 000313154200035
Klíčová slova anglicky HIGH-POWER LASER; APPROXIMATE COULOMB POTENTIALS; INDUCED DIELECTRIC-BREAKDOWN; AUXILIARY BASIS-SETS; VIBRATIONAL FREQUENCIES; GAS-MIXTURES; INFORMATIONAL POLYMERS; EMISSION-SPECTROSCOPY; NA+-MONTMORILLONITE; PREBIOTIC SYNTHESIS
Štítky ok, rivok
Příznaky Mezinárodní význam, Recenzováno
Změnil Změnila: Olga Křížová, učo 56639. Změněno: 14. 2. 2013 05:28.
Anotace
The formamide-based synthesis of nucleic acids is considered as a nonaqueous scenario for the emergence of biomolecules from inorganic matter. In the current study, we scrutinized the chemical composition of formamide ices mixed with an FeNi meteorite material treated with laser-induced dielectric breakdown plasma created in nitrogen buffer gas. These experiments aimed to capture the first steps of those chemical transformations that may lead to the formation of nucleobases during the impact of an extraterrestrial icy body containing formamide on an early Earth atmosphere. High-resolution FT-IR spectroscopy combined with quantum chemical calculations was used to analyze the volatile fraction of the products formed during such an event. We have found that the spectrum of the evaporated formamide ices is dominated by the spectral signatures of the dimeric form of formamide. Upon exposure to laser sparks, new well-defined bands appear in the spectrum centered at similar to 820, similar to 995, and similar to 1650 cm(-1). On the basis of quantum chemical calculations, these bands can be assigned to the absorptions of 2-amino-2-hydroxy-acetonitrile and to 2-amino-2-hydroxy-malononitrile, which are formed in a direct reaction between formamide and CN* radicals upon the high-energy impact event. We also show that there is an exergonic reaction route via these intermediates leading to diaminomaleonitrile, which is generally considered to play a key role in the synthesis of nucleobases.
Návaznosti
ED1.1.00/02.0068, projekt VaVNázev: CEITEC - central european institute of technology
VytisknoutZobrazeno: 23. 5. 2022 03:43