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All results from a given calculation for C2H4S (Thiirane)

using model chemistry: QCISD/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-476.157056
Energy at 298.15K-476.161539
HF Energy-475.610823
Nuclear repulsion energy101.166756
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/cc-pVTZ
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 3162 3021 12.73      
2 A1 1521 1454 3.00      
3 A1 1157 1105 2.14      
4 A1 1065 1017 0.59      
5 A1 652 623 23.97      
6 A2 3241 3097 0.00      
7 A2 1213 1159 0.00      
8 A2 916 875 0.00      
9 B1 3255 3110 4.57      
10 B1 975 932 3.00      
11 B1 843 806 0.27      
12 B2 3158 3017 11.53      
13 B2 1494 1427 0.41      
14 B2 1096 1047 25.78      
15 B2 695 664 0.77      

Unscaled Zero Point Vibrational Energy (zpe) 12221.1 cm-1
Scaled (by 0.9555) Zero Point Vibrational Energy (zpe) 11677.3 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/cc-pVTZ
ABC
0.73789 0.35944 0.26746

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.865
C2 0.000 0.741 -0.795
C3 0.000 -0.741 -0.795
H4 -0.912 1.250 -1.074
H5 0.912 1.250 -1.074
H6 0.912 -1.250 -1.074
H7 -0.912 -1.250 -1.074

Atom - Atom Distances (Å)
  S1 C2 C3 H4 H5 H6 H7
S11.81831.81832.48062.48062.48062.4806
C21.81831.48161.08081.08082.20712.2071
C31.81831.48162.20712.20711.08081.0808
H42.48061.08082.20711.82393.09402.4992
H52.48061.08082.20711.82392.49923.0940
H62.48062.20711.08083.09402.49921.8239
H72.48062.20711.08082.49923.09401.8239

picture of Thiirane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
S1 C2 C3 65.957 S1 C2 H4 115.290
S1 C2 H5 115.290 S1 C3 C2 65.957
S1 C3 H6 115.290 S1 C3 H7 115.290
C2 S1 C3 48.085 C2 C3 H6 118.084
C2 C3 H7 118.084 C3 C2 H4 118.084
C3 C2 H5 118.084 H4 C2 H5 115.079
H6 C3 H7 115.079
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability