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• W4385549002 abstract "Abstract Nitriles are key reactants in prebiotic synthesis networks of RNA bases and amino acids. The detection of CH 3 CN and other complex nitriles in planet-forming disks suggests that such molecules are regularly delivered to nascent planets, increasing the likelihood of origins of life outside of Earth. In this paper, we investigate the formation of CH 3 CN and the closely related imines from the vacuum ultraviolet irradiation of NH 3 :C 2 H 6 , NH 3 :C 2 H 4 , and NH 3 :C 2 H 2 ice mixtures at 10–50 K. CH 3 CN is formed in a subset of these experiments, with the highest yield of ∼5% with respect to the initial NH 3 abundance achieved at the lowest ice temperatures for the least saturated hydrocarbon ice mixture. We find that the imine CH 3 CH=NH serves as an intermediate for the production of CH 3 CN in all ices and its yield generally appears higher than that of CH 3 CN. If the investigated ice chemistry is an important formation pathway of nitriles, we should observe CH 3 CH=NH > CH 3 CN. The opposite is true toward the Galactic Center, while no published constraints on CH 3 CH=NH exist in disks. Such constraints are needed to distinguish between the formation pathway presented in this work and other possible gas and ice nitrile formation pathways in different astrophysical environments. In the meantime, we conclude that NH 3 :hydrocarbon ice photochemistry is an excellent candidate for efficient low-temperature interstellar imine production." @default.
• W4385549002 created "2023-08-04" @default.
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• W4385549002 date "2023-08-01" @default.
• W4385549002 modified "2023-09-23" @default.
• W4385549002 title "The Formation of Imines and Nitriles during VUV Photoirradiation of NH₃:C₂H_x Ice Mixtures" @default.
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• W4385549002 doi "https://doi.org/10.3847/1538-4357/acda99" @default.
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