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Experimental data for CH2CS (Thioketene)

22 02 02 11 45
Other names
Ethenethione; Ketene, thio-;
INChI INChIKey SMILES IUPAC name
InChI=1S/C2H2S/c1-2-3/h1H2 CWMKZYCJCZVSHO-UHFFFAOYSA-N C=C=S
State Conformation
1A1 C2V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
1 A1 3020   webbook      
2 A1 1757          
3 A1 1332          
4 A1 850          
5 B1 698          
6 B1 414          
7 B2 3107          
8 B2 922          
9 B2 357          

vibrational zero-point energy: 6228.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CH2CS (Thioketene).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
  0.18878 0.18494 1979Geo/Kro:365-373

Calculated rotational constants for CH2CS (Thioketene).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of Thioketene

Point Group C2v


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rCS 1.554 0.003 2 3 1979Geo/Kro:365-373
rCC 1.314 0.003 1 2 1979Geo/Kro:365-373
rCH 1.090 0.006 1 4 1979Geo/Kro:365-373
aHCH 120.3 0.5 4 1 5 1979Geo/Kro:365-373

Cartesians
Atom x (Å) y (Å) z (Å)
C1 0.0000 0.0000 1.8341
C2 0.0000 0.0000 0.5197
S3 0.0000 0.0000 -1.0345
H4 0.0000 0.9450 2.3767
H5 0.0000 -0.9450 2.3767

Atom - Atom Distances bond lengths
Distances in Å
  C1 C2 S3 H4 H5
C1   1.31442.86861.08971.0897
C2 1.3144   1.55422.08362.0836
S3 2.86861.5542   3.53973.5397
H4 1.08972.08363.5397   1.8900
H5 1.08972.08363.53971.8900  

Calculated geometries for CH2CS (Thioketene).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
C1 C2 S3 180.000 C2 C1 H4 119.864
C2 C1 H5 119.864 H4 C1 H5 120.273

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 2
C=C 1
C=S 1

Connectivity
Atom 1 Atom 2
C1 C2
C1 H4
C1 H5
C2 S3
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A1

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
8.770       webbook
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 1A1 C2v     1.020 1.020 1979Geo/Kro:365-373   C2v 1 2
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for CH2CS (Thioketene).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 1A1 C2v       C2v 1 2

Calculated electric quadrupole moments for CH2CS (Thioketene).

References
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squib reference DOI
1979Geo/Kro:365-373 K GEORGIOU, HW KROTO, BM LANDSBERG "The Microwave Spectrum, Substitution Structure, and Dipole Moment of Thioketen, H2C=C=S" J. MOL. SPECT. 77,365-373 (1979) 10.1016/0022-2852(79)90178-4
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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