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All results from a given calculation for C2H4S (Thiirane)

using model chemistry: QCISD/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at QCISD/6-31G**
 hartrees
Energy at 0K-475.995214
Energy at 298.15K-475.999728
HF Energy-475.553159
Nuclear repulsion energy101.121622
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at QCISD/6-31G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3213 3024 12.89      
2 A1 1565 1473 6.39      
3 A1 1186 1117 4.70      
4 A1 1095 1031 0.14      
5 A1 669 630 23.47      
6 A2 3296 3103 0.00      
7 A2 1234 1162 0.00      
8 A2 946 891 0.00      
9 B1 3308 3114 9.28      
10 B1 1005 946 4.26      
11 B1 864 814 0.14      
12 B2 3208 3020 14.12      
13 B2 1535 1445 0.01      
14 B2 1129 1063 34.80      
15 B2 701 660 0.93      

Unscaled Zero Point Vibrational Energy (zpe) 12477.7 cm-1
Scaled (by 0.9414) Zero Point Vibrational Energy (zpe) 11746.5 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at QCISD/6-31G**
ABC
0.73731 0.35921 0.26716

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.867
C2 0.000 0.742 -0.795
C3 0.000 -0.742 -0.795
H4 -0.911 1.250 -1.082
H5 0.911 1.250 -1.082
H6 0.911 -1.250 -1.082
H7 -0.911 -1.250 -1.082

Atom - Atom Distances (Å)
  S1 C2 C3 H4 H5 H6 H7
S11.81961.81962.48772.48772.48772.4877
C21.81961.48431.08181.08182.20932.2093
C31.81961.48432.20932.20931.08181.0818
H42.48771.08182.20931.82233.09362.4999
H52.48771.08182.20931.82232.49993.0936
H62.48772.20931.08183.09362.49991.8223
H72.48772.20931.08182.49993.09361.8223

picture of Thiirane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
S1 C2 C3 65.929 S1 C2 H4 115.698
S1 C2 H5 115.698 S1 C3 C2 65.929
S1 C3 H6 115.698 S1 C3 H7 115.698
C2 S1 C3 48.142 C2 C3 H6 117.994
C2 C3 H7 117.994 C3 C2 H4 117.994
C3 C2 H5 117.994 H4 C2 H5 114.750
H6 C3 H7 114.750
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability