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C2H2S crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one C2H2S sheet oriented in the (0, 0, 1) direction. C is bonded in a single-bond geometry to one H1+ and three equivalent S2- atoms. The C–H bond length is 1.10 Å. All C–S bond lengths are 1.90 Å. H1+ is bonded in a single-bond geometry to one C atom. S2- is bonded to six equivalent C atoms to form edge-sharing SC6 octahedra.
Observations of nine oxygen- and sulfur-containing organic molecules have been made toward the cold dark clouds TMC-1 and L134N. The presence of paraketene (H2C2O) in TMC-1 is confirmed for orthoketene, and has been observed for the first time and a total ketene column density of about 10 to the 13th/sq cm is found. Thioformaldehyde (H2CS) is easily detectable in both TMC-1 and L134N, with a column density about five times larger in the former source. The fractional abundance of ketene is comparable to the predictions of ion-molecule chemistry, while that of thioformaldehyde in TMC-1 is one to two orders of magnitude greater than that expected from such models at steady state. Interstellar sulfur chemistry thus continues to be poorly understood. Upper limits are set for the column densities of formic acid (HCOOH), vinyl alcohol (CH2CHOH), methyl formate (HCO2CH3), formamide (NH2CHO), methyl mercaptan (CH3SH), isothiocyanic acid (HNCS), and thioketene (H2C2S) in both sources.