Erratum: “Propionamide (C₂H₅CONH₂): The Largest Peptide-like Molecule in Space” (2021, ApJ, 919, 4)

Abstract

This erratum corrects the value of the vibrational partition function of propionamide in the published article, where we made a mistake in the values of the vibrational partition function of propionamide. ModificationWe would like to present the corrected values of the vibrational partition function in Table 2. The vibrational partition functions given in Table 2 of the published article are from another isotopic species. The revised partition functions show minor differences with respect to the published ones. The column density of propionamide was estimated by visual matching in Weeds. We did not change the value as the change of partition function is small. See Figure 5 for clean lines, and Figure 7 for partially blended v = 1 lines of propionamide, with synthetic spectra with updated partition functions overlayed. We could see from these two figures that the change of synthetic spectra with updated partition functions is negligible in comparison with Figure 5 and Figure 7 in the published article, and the synthetic spectra are still consistent with the observed lines.

Substituent effects in the tautomerization of imidic acids R−C(OH)=NH → R−C(O)NH2: Kinetic implications for the formation of peptide bonds in the interstellar medium

“…Thus obviously HCN which reacts to formamide, cyanic acid [40][41][42] HO−CN to carbamic acid, the misnamed cyanamide 43,44 H 2 N−CN to urea, formyl cyanide 45 HCO−CN to glyoxylamide, methyl cyanide CH 3 CN to acetamide, vinyl cyanide 46 H 2 C=CH−CN to acrylamide, 47 amino acetonitrile 48 H 2 NCH 2 −CN to glycinamide, hydroxy-acetonitrile or glycolonitrile 49 HOCH 2 −CN to glycolamide 50 and ethyl cyanide 51 CH 3 CH 2 CN to propionamide. 47,52,53 Three further nitriles were considered: firstly, cyanogen NCCN, R=CN, which lacks a permanent dipole moment and hence is undetectable but the protonated form NCCNH + has been found in the cold dark clouds TMC-1 and L483, 54 secondly, its isomer isocyanogen 55,56 CNCN and thirdly, acetyl cyanide CH 3 C(O)CN which will react to pyruvamide, were also included.…”