Accurate structural and spectroscopic characterization of prebiotic molecules: The neutral and cationic acetyl cyanide and their related species

In an effort to provide an accurate structural and spectroscopic characterization of acetyl cyanide, its two enolic isomers and the corresponding cationic species, state-of-the-art computational methods, and approaches have been employed. The coupled-cluster theory including single and double excita...

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Bibliographic Details
Published in:The Journal of chemical physics 2015-11, Vol.143 (18), p.184314-184314
Main Authors: Bellili, A, Linguerri, R, Hochlaf, M, Puzzarini, C
Format: Article
Language:English
Subjects:
Cations
Chemical Sciences
Cyanides
Ionization potentials
Isomers
or physical chemistry
Physics
Reliability analysis
Reliability engineering
Structural analysis
Structural reliability
Theoretical and
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Summary:In an effort to provide an accurate structural and spectroscopic characterization of acetyl cyanide, its two enolic isomers and the corresponding cationic species, state-of-the-art computational methods, and approaches have been employed. The coupled-cluster theory including single and double excitations together with a perturbative treatment of triples has been used as starting point in composite schemes accounting for extrapolation to the complete basis-set limit as well as core-valence correlation effects to determine highly accurate molecular structures, fundamental vibrational frequencies, and rotational parameters. The available experimental data for acetyl cyanide allowed us to assess the reliability of our computations: structural, energetic, and spectroscopic properties have been obtained with an overall accuracy of about, or better than, 0.001 Å, 2 kcal/mol, 1-10 MHz, and 11 cm(-1) for bond distances, adiabatic ionization potentials, rotational constants, and fundamental vibrational frequencies, respectively. We are therefore confident that the highly accurate spectroscopic data provided herein can be useful for guiding future experimental investigations and/or astronomical observations.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4935493