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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-475.746953
Energy at 298.15K-475.751281
HF Energy-475.475520
Nuclear repulsion energy96.657553
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 3156 3042 4.96      
2 A1 1540 1484 2.82      
3 A1 1144 1102 3.57      
4 A1 1086 1047 2.53      
5 A1 553 533 19.49      
6 A2 3239 3121 0.00      
7 A2 1238 1193 0.00      
8 A2 890 857 0.00      
9 B1 3255 3136 7.30      
10 B1 917 883 4.72      
11 B1 869 837 0.77      
12 B2 3149 3034 6.47      
13 B2 1519 1464 2.97      
14 B2 1104 1064 44.38      
15 B2 558 538 0.70      

Unscaled Zero Point Vibrational Energy (zpe) 12107.9 cm-1
Scaled (by 0.9636) Zero Point Vibrational Energy (zpe) 11667.2 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
0.72520 0.31143 0.23898

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 0.933
C2 0.000 0.745 -0.869
C3 0.000 -0.745 -0.869
H4 -0.921 1.269 -1.125
H5 0.921 1.269 -1.125
H6 0.921 -1.269 -1.125
H7 -0.921 -1.269 -1.125

Atom - Atom Distances (Å)
  S1 C2 C3 H4 H5 H6 H7
S11.94971.94972.58732.58732.58732.5873
C21.94971.49091.08981.08982.22972.2297
C31.94971.49092.22972.22971.08981.0898
H42.58731.08982.22971.84143.13562.5379
H52.58731.08982.22971.84142.53793.1356
H62.58732.22971.08983.13562.53791.8414
H72.58732.22971.08982.53793.13561.8414

picture of Thiirane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
S1 C2 C3 67.522 S1 C2 H4 113.655
S1 C2 H5 113.655 S1 C3 C2 67.522
S1 C3 H6 113.655 S1 C3 H7 113.655
C2 S1 C3 44.957 C2 C3 H6 118.711
C2 C3 H7 118.711 C3 C2 H4 118.711
C3 C2 H5 118.711 H4 C2 H5 115.314
H6 C3 H7 115.314
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability