Chemical modelling of complex organic molecules with peptide-like bonds in star-forming regions

摘要: Peptide bonds (N-C=O) play a key role in metabolic processes since they link amino acids into peptide chains or proteins. Recently, several molecules containing peptide-like have been detected across multiple environments the interstellar medium (ISM), growing need to fully understand their chemistry and forming larger pre-biotic molecules. We present comprehensive study of three bonds: HNCO, NH$_2$CHO, CH$_3$NCO. also included other CHNO isomers (HCNO, HOCN), C$_2$H$_3$NO (CH$_3$OCN, CH$_3$CNO) study. used \uclchem gas-grain chemical code our network all possible formation/destruction pathways these recently investigated either by theoretical calculations laboratory experiments. Our predictions are compared observations obtained toward proto-star IRAS16293$-$2422 L1544 pre-stellar core. results show that some reactions involving be modified match observations. Consistently with recent findings, hydrogenation is unlikely produce NH$_2$CHO on grain surfaces, while combination radical-radical surface gas-phase better alternative. In addition, for when slightly higher activation energy 25$\,$K considered reaction $\rm NH_2 + H_2CO \rightarrow NH_2CHO H$. Finally, modelling shows observed correlation between HNCO star-forming regions may come from fact react temperature same manner rather than direct two species.