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Linear or Cyclic? Theoretical Investigation of Astrophysically Relevant Magnesium-Bearing MgCnH Carbon Chains and Related Isomers

Gomes, A Karolyna M S, Oliveira, Ricardo R, Cardozo, Thiago M, Fantuzzi, Felipe (2025) Linear or Cyclic? Theoretical Investigation of Astrophysically Relevant Magnesium-Bearing MgCnH Carbon Chains and Related Isomers. Journal of Computational Chemistry, 46 (2). Article Number e70031. ISSN 0192-8651. E-ISSN 1096-987X. (doi:10.1002/jcc.70031) (KAR id:108498)

Abstract

Magnesium-containing molecules, including MgC2H, MgC4H, and MgC6H, have been detected in the interstellar medium, largely facilitated by their high dipole moments. However, despite great efforts, MgC2m + 1H species remain elusive. Given the challenges in obtaining experimental data for these molecules, theoretical studies play a crucial role in guiding their detection. In this work, we present a theoretical analysis of MgCnH isomers (n = 4-7) using density functional theory and coupled-cluster methods to identify low-lying isomers and characterize their structural and electronic properties. Our findings reveal that across the entire series investigated, the global minimum geometry is linear for even values of n, whereas for odd values, a cyclic geometry is favored. Additionally, our calculations highlight the enhanced stability of anionic MgCnH- systems, providing insights that could aid future astronomical detections in the interstellar medium.

Item Type: Article
DOI/Identification number: 10.1002/jcc.70031
Uncontrolled keywords: Magnesium, DFT, Coupled Cluster, Theoretical Chemistry, Astrochemistry
Subjects: Q Science
Q Science > QD Chemistry
Divisions: Divisions > Division of Natural Sciences > Chemistry and Forensics
Funders: National Council for Scientific and Technological Development (https://ror.org/03swz6y49)
Coordenação de Aperfeicoamento de Pessoal de Nível Superior (https://ror.org/00x0ma614)
European Cooperation in Science and Technology (https://ror.org/01bstzn19)
SWORD Depositor: JISC Publications Router
Depositing User: JISC Publications Router
Date Deposited: 12 Feb 2025 14:50 UTC
Last Modified: 16 Feb 2025 21:26 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/108498 (The current URI for this page, for reference purposes)

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