Searching for Propionamide (C₂H₅CONH₂) toward Sagittarius B2 at Centimeter Wavelengths

Abstract The formation of molecules in the interstellar medium (ISM) remains a complex and unresolved question astrochemistry. A group particular interest involves linkage between carboxyl amine group, similar to that peptide bond. detection containing these peptide-like bonds ISM can help elucidate possible mechanisms, as well indicate level molecular complexity available within certain regions ISM. Two simplest bond, formamide (NH 2 CHO) acetamide (CH 3 CONH ), have previously been detected toward star-forming region Sagittarius B2 (Sgr B2). Recently, propionamide (C H 5 ) was reported Sgr B2(N) with Atacama Large Millimeter/submillimeter Array (ALMA) observations at millimeter wavelengths. Yet, this has questioned by others from same set ALMA no statistically significant line emission identified any uncontaminated transitions. Using Prebiotic Interstellar Molecule Survey (PRIMOS) observations, we report an additional search for C centimeter wavelengths conducted Green Bank Telescope. No spectral signatures were detected. An upper limit determined be N T < 1.8 × 10 14 cm ?2 /CH ratio is found <2.34. This work again questions initial indicates more structures may difficulty forming or are below limits current astronomical facilities. Additional structurally related species provided aid future laboratory searches.