S. Zeng, I. Jiménez-Serra, V. M. Rivilla, J. Martín-Pintado, L. F. Rodríguez-Almeida, B. Tercero, P. de Vicente, F. Rico-Villas, L. Colzi, S. Martín, and M. A. Requena-Torres
reported on
Probing the Chemical Complexity of Amines in the ISM: Detection of Vinylamine (C₂H₃NH₂) and Tentative Detection of Ethylamine (C₂H₅NH₂)
Astrophys. J. Lett. 920 (2021), Art. No. L27.
Vinylamine (C₂H₃NH₂) was detected through five un- or slightly blended transitions and four partially blended transitions with 4 ≤ J ≤ 9 and K_a ≤ 3 in the course of an unbiased molecular line survey of the quiescent giant molecular cloud G+0.693−0.027, about 1' north-east of Sagittarius B2(N), carried out with the IRAM 30 m dish at 3 mm. The lines were modeled quite well employing an LTE fit with T_rot = 18 ± 3 K. Vinylamine is about a factor of 50 less abundant than methylamine.
Using additional observations with the Yebes 40 m dish at 7 mm, the authors identify tentatively four lines of ethylamine (C₂H₅NH₂) with modest signal-to-noise ratio that appear to be not or only slightly blended and three that are somewhat more blended. The fit results suggest that ethylamine would be about a factor of 125 less abundant than methylamine. The identification appears to be very reasonable. Therefore, the molecule shows now up in the table as tentatively detected.

Contributor(s): H. S. P. Müller; 12, 2021; 03, 2022