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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Could HCN Be Responsible for the Formamide Synthesis in Earth?s Primitive Atmosphere?

Full text
Author(s):
Vichietti, R. M. [1] ; Spada, R. F. K. [2] ; da Silva, A. B. F. [3] ; Machado, F. B. C. [1] ; Haiduke, R. L. A. [3]
Total Authors: 5
Affiliation:
[1] Inst Tecnol Aeronaut, Dept Quim, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[2] Inst Tecnol Aeronaut, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[3] Univ Sao Paulo, Inst Quim Sao Carlos, Dept Quim & Fis Mol, CP 780, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES; v. 245, n. 1 NOV 2019.
Web of Science Citations: 0
Abstract

The forward and reverse H2O + HCN HCONH2 global reactions were studied along temperatures from 200 to 4000 K. Equilibrium geometries and vibrational frequencies were obtained from calculations at the Coupled Cluster theory with single and double excitations (CCSD)/cc-pVDZ level; whereas enthalpies, Gibbs energies, and thermal rate constants were achieved by means of the CCSD(T)/CBS//CCSD/cc-pVDZ combined treatment. The estimates performed considering physical and chemical conditions proposed for the primitive atmosphere of Earth indicate that the formamide concentration might be 3.0?4.4 times larger than the one for HCN at 700 K, suggesting that this forward gas phase reaction could provide an efficient production route for formamide during an age just before the formation of early oceans. This route is also considerably fast once the chemical equilibrium is attained in some decades at this temperature. In short, our research reinforces that more complex organic compounds, such as formamide, could be synthetized in the Earth?s primordial atmosphere, even considering a neutral atmosphere scenario composed mainly by H2O, CO2, and some N-2. (AU)

FAPESP's process: 19/07671-4 - Theoretical study of molecules in astrophysical environments
Grantee:Rene Felipe Keidel Spada
Support Opportunities: Regular Research Grants
FAPESP's process: 17/07707-3 - Excited states and biradicalar nature of poliacenes and periacenes
Grantee:Francisco Bolivar Correto Machado
Support Opportunities: Regular Research Grants
FAPESP's process: 14/23714-1 - Electronic structure relativistic calculations for evaluation of new prolapse-free basis sets
Grantee:Roberto Luiz Andrade Haiduke
Support Opportunities: Regular Research Grants
FAPESP's process: 18/05691-5 - Application of quantum chemistry methods in the study of possible routes for formation of small molecular systems in different astrophysical environments
Grantee:Rafael Mario Vichietti
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 10/18743-1 - Employment of multipoles from the quantum theory of atoms in molecules and kinetic studies in systems found in the interstellar medium
Grantee:Roberto Luiz Andrade Haiduke
Support Opportunities: Regular Research Grants