return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for C2H4S (Thiirane)

using model chemistry: CCSD/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CCSD/6-311G**
 hartrees
Energy at 0K-476.051530
Energy at 298.15K-476.056049
HF Energy-475.589396
Nuclear repulsion energy101.098655
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 CCSD/6-311G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3163 3163 14.16      
2 A1 1536 1536 5.12      
3 A1 1173 1173 4.67      
4 A1 1090 1090 0.09      
5 A1 671 671 23.94      
6 A2 3245 3245 0.00      
7 A2 1216 1216 0.00      
8 A2 948 948 0.00      
9 B1 3258 3258 9.10      
10 B1 1007 1007 8.44      
11 B1 860 860 0.11      
12 B2 3159 3159 12.73      
13 B2 1505 1505 0.13      
14 B2 1132 1132 42.22      
15 B2 699 699 1.58      

Unscaled Zero Point Vibrational Energy (zpe) 12330.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 12330.3 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 CCSD/6-311G**
ABC
0.73290 0.36039 0.26759

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD/6-311G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
S1 0.000 0.000 0.865
C2 0.000 0.745 -0.793
C3 0.000 -0.745 -0.793
H4 -0.917 1.251 -1.079
H5 0.917 1.251 -1.079
H6 0.917 -1.251 -1.079
H7 -0.917 -1.251 -1.079

Atom - Atom Distances (Å)
  S1 C2 C3 H4 H5 H6 H7
S11.81731.81732.48622.48622.48622.4862
C21.81731.48921.08561.08562.21442.2144
C31.81731.48922.21442.21441.08561.0856
H42.48621.08562.21441.83393.10172.5015
H52.48621.08562.21441.83392.50153.1017
H62.48622.21441.08563.10172.50151.8339
H72.48622.21441.08562.50153.10171.8339

picture of Thiirane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
S1 C2 C3 65.813 S1 C2 H4 115.523
S1 C2 H5 115.523 S1 C3 C2 65.813
S1 C3 H6 115.523 S1 C3 H7 115.523
C2 S1 C3 48.373 C2 C3 H6 117.794
C2 C3 H7 117.794 C3 C2 H4 117.794
C3 C2 H5 117.794 H4 C2 H5 115.272
H6 C3 H7 115.272
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability