thioxoethenylidene
{{Chembox
|ImageFile = Thioxoethenylidene-3D-vdW.png
|IUPACName = Thioxoethenylidene
|Section1 = {{Chembox Identifiers
|PubChem = 101170561
|ChemSpiderID = 10800798
|StdInChI=1S/C2S/c1-2-3
|StdInChIKey = NELREAXCVQVNGC-UHFFFAOYSA-N
|SMILES = [C+]#C[S-]
}}
|Section2 = {{Chembox Properties
|C=2|S=1
}}
|Section3={{Chembox Related
}}
}}
Thioxoethenylidene, is a reactive heteroallene molecule with formula CCS.{{cite journal|last1=Maier|first1=Günther|last2=Reisenauer|first2=Hans Peter|last3=Ruppel|first3=Raimund|title=Thioxoethenylidene C2S: A Matrix-Spectroscopic Study|journal=European Journal of Organic Chemistry|date=October 2004|volume=2004|issue=20|pages=4197–4202|doi=10.1002/ejoc.200400252}}
Occurrence
CCS is found in space in large quantities. This includes the Taurus Molecular Cloud in TMC-1, TMC-1c and L1521B. These are likely in young starless molecular cloud cores.{{cite journal|last1=Roy|first1=Nirupam|last2=Datta|first2=Abhirup|last3=Momjian|first3=Emmanuel|last4=Sarma|first4=Anuj P.|title=Imaging of the CCS 22.3 GHz emission in the Taurus Molecular Cloud complex|arxiv=1106.4011|journal=The Astrophysical Journal|date=20 September 2011|volume=739|issue=1|pages=L4|doi=10.1088/2041-8205/739/1/L4|bibcode=2011ApJ...739L...4R|s2cid=118857505}}
Production
By condensing propadienedithione SCCCS or thioxopropadienone OCCCS in solid argon and irradiating with ultraviolet radiation, CCS is formed. Another way is via a glow discharge in a mixture of carbon disulfide and helium. Yet another way is through electron irradiation of sulfur containing heterocycles.
CCS and the anion CCS− can be formed in solid neon matrices also.{{cite journal|last1=Riaplov|first1=Evgueni|last2=Wyss|first2=Muriel|last3=Maier|first3=John P|last4=Panten|first4=Dietmar|last5=Chambaud|first5=Gilberte|last6=Rosmus|first6=Pavel|last7=Fabian|first7=Juergen|title=Electronic absorption spectra of CCS− and CCS in neon matrices|journal=Journal of Molecular Spectroscopy|date=November 2003|volume=222|issue=1|pages=15–21|doi=10.1016/S0022-2852(02)00050-4|bibcode=2003JMoSp.222...15R}}
Properties
CCS can be a ligand. It can form an asymmetrical bridge between two molybdenum atoms in Mo2(μ,σ(C):η2(C′S)-CCS)(CO)4(hydrotris(3,5-dimethylpyrazol-1-yl)borate)2 In this one carbon atom has a triple bond to a molybdenum and the other has a double bond to the other molybdenum atom, which also has a single bond to the sulfur atom.{{cite journal|last1=Caldwell|first1=Lorraine M.|last2=Hill|first2=Anthony F.|last3=Stranger|first3=Robert|last4=Terrett|first4=Richard N. L.|last5=von Nessi|first5=Kassetra M.|last6=Ward|first6=Jas S.|last7=Willis|first7=Anthony C.|title=Thioxoethenylidene (CCS) as a Bridging Ligand|journal=Organometallics|date=12 January 2015|volume=34|issue=1|pages=328–334|doi=10.1021/om5011319|hdl=1885/13701|hdl-access=free}}
The ultraviolet spectrum shows absorption bands between 2800 and 3370 Å and also in the near infrared between 7500 and 10000 Å.
CCS can react with CCCS to form C5S.
The infrared spectrum in solid argon shows a vibration band at 1666.6 cm−1 called v1 and another called v2 at 862.7 cm−1. The 2v1 overtone is at 3311.1 cm−1. A combination vibration and bending band is at 2763.4 cm−1
The microwave spectrum has emission lines 43 − 32 at 45.4 GHz and 21 - 10 at 22.3 GHz, important for detection of molecules in molecular clouds.
Theoretical predictions show that the C-C bond is 1.304 Å long and the C–S bond is 1.550 Å.{{cite journal|last1=Xie|first1=Yaoming|last2=Schaefer|first2=Henry F.|title=Naked organosulfur clusters: The infrared spectrum of the C2S molecule|journal=The Journal of Chemical Physics|date=March 1992|volume=96|issue=5|pages=3714–3717|doi=10.1063/1.461874|bibcode=1992JChPh..96.3714X}}