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Target Compounds for the Interstellar Medium

The choice of candidates for the Interstellar Medium (ISM) is a determining step. These last years, the formal simple insertion of a CH2 group in a C-H bond of detected compounds has given the highest amount of detected organic species like ethanimine (CH3CHNH), methyl acetate (CH3OC(O)CH3), ethanethiol (CH3CH2SH), isobutyronitrile (Me2CHCN), methyl isocyanate (CH3NCO), methyl epoxyde (CH3(CHCH2O)), ... [1] However, the search for an alternative approach is more than necessary to open the list to original compounds. Some years ago, Ellinger et al. proposed the « MEP » (Minimum Energy Principle) [2] to attempt to explain a posteriori the list of the detected organic species. Most of them correspond to the thermodynamically most stable isomer for a given formula. Isomers can be present but the most stable one should be the most abundant. However, for the C3H2O formula, two isomers have been detected but the thermodynamically most stable compound propadienone (H2C=C=C=O) is still missing after many attempts to detect it. Nevertheless, even if probably not perfect, this approach could be an efficient tool to select a target isomer for a given formula not yet represented in the ISM. The case of C2H3NO will be presented. [3,4]