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Experimental data for C5H6S (Thiophene, 3-methyl-)

22 02 02 11 45
Other names
3-Methylthiophene; 3-Thiotolene; Methyl-3-thiophene; Thiophene, 3-methyl-;
INChI INChIKey SMILES IUPAC name
InChI=1S/C5H6S/c1-5-2-3-6-4-5/h2-4H,1H3 QENGPZGAWFQWCZ-UHFFFAOYSA-N CC1=CSC=C1 3-Methylthiophene
State Conformation
1A' CS
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 82.59 0.92 kJ mol-1 webbook
Hfg(0K) enthalpy of formation   0.92 kJ mol-1 webbook
Entropy (298.15K) entropy     J K-1 mol-1  
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity     kJ mol-1  
Heat Capacity (298.15K) heat capacity 95.79   J K-1 mol-1 TRC
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 A' 3111   1996Her/Ram:2907      
2 A' 3104   1996Her/Ram:2907      
3 A' 3062   1996Her/Ram:2907      
4 A' 2971   1996Her/Ram:2907      
5 A' 2923   1996Her/Ram:2907      
6 A' 1543   1996Her/Ram:2907      
7 A' 1447   1996Her/Ram:2907      
8 A' 1407   1996Her/Ram:2907      
9 A' 1385   1996Her/Ram:2907      
10 A' 1373   1996Her/Ram:2907      
11 A' 1234   1996Her/Ram:2907      
12 A' 1154   1996Her/Ram:2907      
13 A' 1080   1996Her/Ram:2907      
14 A' 993   1996Her/Ram:2907      
15 A' 931   1996Her/Ram:2907      
16 A' 857   1996Her/Ram:2907      
17 A' 830   1996Her/Ram:2907      
18 A' 659   1996Her/Ram:2907      
19 A' 542   1996Her/Ram:2907      
20 A' 329   1996Her/Ram:2907      
21 A" 2945   1996Her/Ram:2907      
22 A" 1452   1996Her/Ram:2907      
23 A" 1036   1996Her/Ram:2907      
24 A" 874   1996Her/Ram:2907      
25 A" 762   1996Her/Ram:2907      
26 A" 685   1996Her/Ram:2907      
27 A" 594   1996Her/Ram:2907      
28 A" 464   1996Her/Ram:2907      
29 A" 238   1996Her/Ram:2907      
30 A"            

vibrational zero-point energy: 19992.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for C5H6S (Thiophene, 3-methyl-).
Gas-phase IR spectra can be found in the NIST Chemistry Webbook here.
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
       

Calculated rotational constants for C5H6S (Thiophene, 3-methyl-).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of Thiophene, 3-methyl-

Point Group Cs


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 1.714   4 7 1976Hellwege(II/7) !assumed
rCC 1.370   2 6 1976Hellwege(II/7) !assumed
rCC 1.423   2 3 1976Hellwege(II/7) !assumed, between 2=
rCH 1.090   1 2 1976Hellwege(II/7) !assumed, in ring
rCH 1.081   8 11 1976Hellwege(II/7) !assumed, on methyl
rCC 1.530   3 11 1976Hellwege(II/7)
aCSC 92.2 4 7 6 1976Hellwege(II/7) !assumed
aCCS 111.5 2 6 7 1976Hellwege(II/7) !assumed
aCCC 112.45 3 2 6 1976Hellwege(II/7) !assumed
aHCS 119.85 5 6 7 1976Hellwege(II/7) !assumed
aHCH 109.5 8 11 9 1976Hellwege(II/7) !assumed
aCCC 123 2 3 11 1976Hellwege(II/7) towards methyl

These cartesians were determined using some assumed coordinate values. Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for C5H6S (Thiophene, 3-methyl-).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 6
C-C 2
C=C 2
C-S 2

Connectivity
Atom 1 Atom 2
H1 C2
C2 C3
C2 C6
C3 C4
C3 C11
C4 S7
C4 H12
H5 C6
C6 S7
H8 C11
H9 C11
H10 C11
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A'

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
8.840   8.700   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 1A' Cs True           Cs 2 3
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 C5H6S (Thiophene, 3-methyl-).
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 1A' Cs True       Cs 2 3

Calculated electric quadrupole moments for C5H6S (Thiophene, 3-methyl-).

References
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squib reference DOI
1976Hellwege(II/7) Hellwege, KH and AM Hellwege (ed.). Landolt-Bornstein: Group II: Atomic and Molecular Physics Volume 7: Structure Data of Free Polyatomic Molecules. Springer-Verlag. Berlin. 1976.  
1996Her/Ram:2907 Hernandez, Ramirez, Casado, and Navarrete. Scaled Quantum-Mechanical Force Field and Vibrational Spectra of 3-Methylthiophene. J. Phys. Chem. Vol. 100. #8. pgs. 2907-2914. 10.1021/jp952961j
TRC Frenkel, M; Marsh, K.N.; Wilhoit, R.C.; Kabo, G.J.; Roganov, G.N.,Thermodynamics of Organic Compounds in the Gas State,Thermodynamics Research Center, College Station, TX, 1994  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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