return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C2H2O (Oxirene)

using model chemistry: CID/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CID/Def2TZVPP
 hartrees
Energy at 0K-152.144727
Energy at 298.15K 
HF Energy-151.651868
Nuclear repulsion energy62.235401
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 CID/Def2TZVPP
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 3515 3515 3.16      
2 A1 1897 1897 2.68      
3 A1 1148 1148 16.60      
4 A1 953 953 60.11      
5 A2 731 731 0.00      
6 B1 608 608 90.13      
7 B2 3439 3439 57.56      
8 B2 1028 1028 5.98      
9 B2 401 401 2.08      

Unscaled Zero Point Vibrational Energy (zpe) 6859.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6859.5 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 CID/Def2TZVPP
ABC
1.13637 0.91282 0.50620

See section I.F.4 to change rotational constant units
Geometric Data calculated at CID/Def2TZVPP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.878
C2 0.000 0.627 -0.455
C3 0.000 -0.627 -0.455
H4 0.000 1.638 -0.781
H5 0.000 -1.638 -0.781

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.47291.47292.33102.3310
C21.47291.25351.06222.2879
C31.47291.25352.28791.0622
H42.33101.06222.28793.2756
H52.33102.28791.06223.2756

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.816 O1 C2 H4 133.038
O1 C3 C2 64.816 O1 C3 H5 133.038
C2 O1 C3 50.367 C2 C3 H5 162.146
C3 C2 H4 162.146
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability