Searches for new interstellar molecules, including a tentative detection of aziridine and a possible detection of propenal

Rotational spectroscopy at millimeter wavelengths is a powerful means of in vestigating the chemistry of dense interstellar clouds. These regions can e xhibit an interesting complement of gas phase molecules, including relative ly complex organics. Here we report the tentative first astronomical detect ion of aziridine (ethylenimine), the possible detection of propenal (acrole in), and upper limits on the abundances of cyclopropenone, furan, hydroxyet hanal (glycolaldehyde), thiohydroxylamine (NH2SH), and ethenol (vinyl alcoh ol) in various interstellar clouds. (C) 2001 Elsevier Science B.V. All righ ts reserved.