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Experimental data for CH3S (thiomethoxy)

22 02 02 11 45
Other names
Methylthio radical;
INChI INChIKey SMILES IUPAC name
InChI=1S/CH3S/c1-2/h1H3 QSLPNSWXUQHVLP-UHFFFAOYSA-N C[S]
State Conformation
2A' C3V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation   1.70 kJ mol-1 1999BIS/CHO805
Hfg(0K) enthalpy of formation 129.86 1.70 kJ mol-1 1999BIS/CHO805
Entropy (298.15K) entropy     J K-1 mol-1  
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity     kJ mol-1  
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 2960   VEELB      
2 A1 1313   VEELB      
3 A1 727   VEELB      
4 E 2706   VEELB      
5 E 1496   VEELB      
6 E 586   VEELB      

vibrational zero-point energy: 7288.0 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CH3S (thiomethoxy).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
5.68000 0.44958   1989Hsu/Liu:6852

Calculated rotational constants for CH3S (thiomethoxy).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of thiomethoxy

Point Group C3v


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
rCH 1.090   1 3 1986End/Sai:1770
rCS 1.791   1 2 1986End/Sai:1770
aHCS 110 2 1 3 1986End/Sai:1770
aHCH 108.94 3 1 4 1986End/Sai:1770 by symmetry

Cartesians
Atom x (Å) y (Å) z (Å)
C1 -1.1018 0.0001 -0.0031
S2 0.6892 0.0000 0.0004
H3 -1.4766 -0.0078 1.0204
H4 -1.4704 0.8988 -0.4977
H5 -1.4695 -0.8918 -0.5105

Atom - Atom Distances bond lengths
Distances in Å
  C1 S2 H3 H4 H5
C1   1.79101.09001.09001.0900
S2 1.7910   2.39402.39162.3909
H3 1.09002.3940   1.76821.7678
H4 1.09002.39161.7682   1.7906
H5 1.09002.39091.76781.7906  

Calculated geometries for CH3S (thiomethoxy).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
S2 C1 H3 110.000 S2 C1 H4 109.819
S2 C1 H5 109.766 H3 C1 H4 108.406
H3 C1 H5 108.372 H4 C1 H5 110.450

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 3
C-S 1

Connectivity
Atom 1 Atom 2
C1 S2
C1 H3
C1 H4
C1 H5
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 2   2A'

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
9.262 0.005     webbook

Electron Affinity (eV)
Electron Affinity unc. reference
1.867 0.004 2002Rie/Tsc:231
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 2A' C3v True           C3v 1 1
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 CH3S (thiomethoxy).
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 2A' C3v True       C3v 1 1

Calculated electric quadrupole moments for CH3S (thiomethoxy).

References
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squib reference DOI
1986End/Sai:1770 Endo, Saito, Hirota, The microwave spectrum of the thiomethoxy radical CH3S, J. Chem. Phys., Vol. 85, # 4, pgs. 1770-1777 10.1063/1.451178
1989Hsu/Liu:6852 Hsu, Y.C.; Liu, X.; Miller, T. "Rotational analysis of … electronic transition of the jet cooled methylthio radical." Journal of Chemical Physics. 90, 6852-6857 (1989) 10.1063/1.456258
1999BIS/CHO805 Bise RT, Choi H, Pedersen HB, Mordaunt DH, Neumark DM, Photodissociation spectroscopy and dynamics of the methylthio radical (CH3S),J. CHEM. PHYS. 110: (2) 805-816 JAN 8 1999 10.1063/1.478048
2002Rie/Tsc:231 JC Rienstra-Kiracofe, GS Tschumper, HF Schaefer III, S Nandi, GB Ellison "Atomic and Molecular Electron Affinities: Photoelectron Experiments and Theoretical Computations" Chemical Reviews 2002, 102, 231-282 10.1021/cr990044u
VEELB M.E. Jacox,"Vibrational and Electronic Energy Levels of Polyatomic Transient Molecules. Supplement B" J. Phys. Chem. Ref. Data, Vol. 32, No. 1, 2003,1-441 10.1063/1.1497629
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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