2020/10/22 by Jacopo Lupi, Cristina Puzzarini, Vincenzo Barone
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Abundance (ecology) #Advanced Chemical Physics Studies #Astrochemistry #Astrophysics #Atmospheric chemistry and aerosols #Chemistry #Interstellar medium #Kinetics #Medicinal chemistry #Molecular Spectroscopy and Structure #Molecule #Organic chemistry #Physics #Quantum mechanics #Reaction rate constant #astro-ph.GA #physics.chem-ph #physics.comp-ph
paper · pdf · doi:10.3847/2041-8213/abc25c
10 pages, 4 figures, 2 tables. Accepted in ApJL
arxiv created 2020/10/22 · openalex publication_date 2020/11/01 · arxiv updated 2020/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Abstract A gas-phase formation route is proposed for the recently detected propargylimine molecule. In analogy to other imines, such as cyanomethanimine, the addition of a reactive radical (C 2 H in the present case) to methanimine (CH 2 NH) leads to reaction channels open also in the harsh conditions of the interstellar medium. Three possible isomers can be formed in the CH 2 NH + C 2 H reaction: Z- and E-propargylimine (Z-,E-PGIM) as well as N-ethynyl-methanimine (N-EMIM). For both PGIM species, the computed global rate coefficient is nearly constant in the 20–300 K temperature range, and of the order of 2–3 × 10 −10 cm 3 molecule −1 s −1 , while that for N-EMIM is about two orders of magnitude smaller. Assuming equal destruction rates for the two isomers, these results imply an abundance ratio for PGIM of [Z]/[E] ∼ 1.5, which is only slightly underestimated with respect to the observational datum.