Probing the Chemical Complexity of Amines in the ISM: Detection of Vinylamine (C₂H₃NH₂) and Tentative Detection of Ethylamine (C₂H₅NH₂)

Amines, in particular primary amines (R-NH$_2$) are closely related to the primordial synthesis of amino acids since they share same structural backbone. However, only limited number has been identified ISM which prevents us from studying their chemistry as well relation pre-biotic species that could lead emergence life. In this letter, we report first interstellar detection vinylamine (C$_2$H$_3$NH$_2$) and tentative ethylamine (C$_2$H$_5$NH$_2$) towards Galactic Centre cloud G+0.693-0.027. The derived abundance with respect H$_2$ is (3.3$\pm$0.4)$\times$10$^{-10}$ (1.9$\pm$0.5)$\times$10$^{-10}$, respectively. inferred ratios C$_2$H$_3$NH$_2$ C$_2$H$_5$NH$_2$ methylamine (CH$_3$NH$_2$) $\sim$0.02 $\sim$0.008 C$_2$H$_3$NH$_2$, several other NH$_2$-bearing compared those obtained high-mass low-mass star-forming regions. Based on recent chemical laboratory studies, possible routes for discussed.