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: CCSD(T)=FULL/aug-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 CCSD(T)=FULL/aug-cc-pVTZ
 hartrees
Energy at 0K-152.296877
Energy at 298.15K 
HF Energy-151.646397
Nuclear repulsion energy61.418691
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(T)=FULL/aug-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 3412 3289        
2 A1 1772 1708        
3 A1 1072 1033        
4 A1 879 847        
5 A2 618 596        
6 B1 505 487        
7 B2 3315 3194        
8 B2 961 926        
9 B2 179 172        

Unscaled Zero Point Vibrational Energy (zpe) 6356.6 cm-1
Scaled (by 0.9637) Zero Point Vibrational Energy (zpe) 6125.9 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(T)=FULL/aug-cc-pVTZ
ABC
1.11254 0.88372 0.49251

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)=FULL/aug-cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.892
C2 0.000 0.635 -0.462
C3 0.000 -0.635 -0.462
H4 0.000 1.646 -0.797
H5 0.000 -1.646 -0.797

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.49581.49582.35912.3591
C21.49581.27081.06512.3062
C31.49581.27082.30621.0651
H42.35911.06512.30623.2925
H52.35912.30621.06513.2925

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.862 O1 C2 H4 133.502
O1 C3 C2 64.862 O1 C3 H5 133.502
C2 O1 C3 50.275 C2 C3 H5 161.636
C3 C2 H4 161.636
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability