Please use this identifier to cite or link to this item: http://elar.urfu.ru/handle/10995/111572
Title: Photolysis of Acetonitrile in a Water-rich Ice as a Source of Complex Organic Molecules: CH3CN and H2O:CH3CN Ices
Authors: Bulak, M.
Paardekooper, D. M.
Fedoseev, G.
Linnartz, H.
Issue Date: 2021
Publisher: EDP Sciences
EDP Sciences
Citation: Photolysis of Acetonitrile in a Water-rich Ice as a Source of Complex Organic Molecules: CH3CN and H2O:CH3CN Ices / M. Bulak, D. M. Paardekooper, G. Fedoseev et al. — DOI 10.1073/pnas.2100338118 // Astronomy and Astrophysics. — 2021. — Vol. 647. — A82.
Abstract: Context. Many C-, O-, and H-containing complex organic molecules (COMs) have been observed in the interstellar medium (ISM) and their formation has been investigated in laboratory experiments. An increasing number of recent detections of large N-bearing COMs motivates our experimental investigation of their chemical origin. Aims. We investigate the potential role of acetonitrile (CH3CN) as a parent molecule to N-bearing COMs, motivated by its omnipresence in the ISM and structural similarity to another well-known precursor species, CH3OH. The aim of the present work is to characterize the chemical complexity that can result from vacuum UV photolysis of a pure CH3CN ice and a more realistic mixture of H2O:CH3CN. Methods. The CH3CN ice and H2O:CH3CN ice mixtures were UV irradiated at 20 K. Laser desorption post ionization time-of-flight mass spectrometry was used to detect the newly formed COMs in situ. We examined the role of water in the chemistry of interstellar ices through an analysis of two different ratios of H2O:CH3CN (1:1 and 20:1). Results. We find that CH3CN is an excellent precursor to the formation of larger nitrogen-containing COMs, including CH3CH2CN, NCCN/CNCN, and NCCH2CH2CN. During the UV photolysis of H2O:CH3CN ice, the water derivatives play a key role in the formation of molecules with functional groups of: imines, amines, amides, large nitriles, carboxylic acids, and alcohols. We discuss possible formation pathways for molecules recently detected in the ISM. © ESO 2021.
Keywords: ASTROCHEMISTRY
CIRCUMSTELLAR MATTER
ISM: MOLECULES
METHODS: LABORATORY: SOLID STATE
MOLECULAR PROCESSES
ULTRAVIOLET: ISM
ACETONITRILE
AMIDES
AMINES
CHEMICAL DETECTION
MASS SPECTROMETRY
MIXTURES
MOLECULES
PHOTOLYSIS
ULTRAVIOLET LASERS
CHEMICAL COMPLEXITY
COMPLEX ORGANIC MOLECULES
EXPERIMENTAL INVESTIGATIONS
FORMATION PATHWAYS
IN-LABORATORY EXPERIMENTS
INTERSTELLAR ICE
INTERSTELLAR MEDIUMS
STRUCTURAL SIMILARITY
ICE
URI: http://elar.urfu.ru/handle/10995/111572
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85102446354
WOS ID: 000629649800001
PURE ID: 21031875
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202039695
metadata.dc.description.sponsorship: Acknowledgements. M.B. and H.L. acknowledge the European Union (EU) and Horizon 2020 funding awarded under the Marie Skłodowska-Curie action to the EUROPAH consortium (grant number 722346) as well as NOVA 5 funding. Additional funding has been realized through a NWO-VICI grant. This work has been supported by the Danish National Research Foundation through the Center of Excellence “InterCat” (Grant agreement no.: DNRF150). We thank N. F. W. Ligterink, A. G. G. M. Tielens, J. Terwischa van Scheltinga, J. Bouwman and T. Lamberts for helpful discussions.
CORDIS project card: H2020: 722346
Appears in Collections:Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC

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