Please use this identifier to cite or link to this item:
Title: The Origin of the E/Z Isomer Ratio of Imines in the Interstellar Medium
Authors: García de la Concepción, J.
Jiménez Serra, I.
Corchado, J. C.
Rivilla, V. M.
Martín Pintado, J.
Keywords: Reaction Rates;Astrochemistry;Prebiotic Astrochemistry;Interstellar Clouds
Issue Date: 29-Apr-2021
Publisher: IOP Science Publishing
DOI: 10.3847/2041-8213/abf650
Published version:
Citation: The Astrophysical Journal Letters 912(1): L6(2021)
Abstract: Recent astronomical observations of both isomers E and Z of imines such as cyanomethanimine, ethanimine, and 2-propyn-1-imine have revealed that the abundances in the interstellar medium (ISM) of these isomers differ by factors of ~3–10. Several theories have been proposed to explain the observed behavior, but none of them successfully explains the [E]/[Z] ratios. In this work we present a detailed study of the kinetics of the one-step E-Z isomerization reactions of cyanomethanimine, ethanimine, and 2-propyn-1-imine under interstellar conditions (in the 10–400 K temperature range). This reaction was previously thought to be nonviable in the ISM due to its associated high-energy barrier (about 13,000 K). In this Letter, we show that considering the multidimensional small curvature tunneling approximation, the tunneling effect enables the isomerization even at low temperatures. This is due to the fact that the representative tunneling energy lies in the vibrational ground state of the least stable isomer up to approximately 150 K, making the reaction constants of the isomerization from the least stable to the most stable isomer basically constant. The predicted [E]/[Z] ratios are almost the same as those reported from the astronomical observations for all imines observed. This study demonstrates that the [E]/[Z] ratio of imines in the ISM strongly depends on their relative stability.
E-ISSN: 2041-8213
ISSN: 2041-8205
Appears in Collections:(CAB) Artículos

Files in This Item:
File Description SizeFormat 
García_de_la_Concepción_2021_ApJL_912_L6.pdf579,58 kBAdobe PDFThumbnail

This item is licensed under a Creative Commons License Creative Commons