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: MP2/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP2/6-311G**
 hartrees
Energy at 0K-152.095173
Energy at 298.15K 
HF Energy-151.620136
Nuclear repulsion energy61.099728
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 MP2/6-311G**
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 3445 3274 2.23 97.05 0.22 0.36
2 A1 1768 1680 1.88 30.54 0.17 0.28
3 A1 1098 1044 3.28 5.39 0.38 0.55
4 A1 894 849 47.78 6.99 0.48 0.65
5 A2 581 552 0.00 1.50 0.75 0.86
6 B1 510 485 88.14 0.55 0.75 0.86
7 B2 3375 3207 48.29 15.93 0.75 0.86
8 B2 955 907 5.68 2.05 0.75 0.86
9 B2 127i 120i 2.85 15.03 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6249.1 cm-1
Scaled (by 0.9502) Zero Point Vibrational Energy (zpe) 5937.9 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 MP2/6-311G**
ABC
1.09997 0.87541 0.48746

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.896
C2 0.000 0.638 -0.465
C3 0.000 -0.638 -0.465
H4 0.000 1.658 -0.793
H5 0.000 -1.658 -0.793

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.50401.50402.36702.3670
C21.50401.27691.07112.3200
C31.50401.27692.32001.0711
H42.36701.07112.32003.3167
H52.36702.32001.07113.3167

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.882 O1 C2 H4 132.902
O1 C3 C2 64.882 O1 C3 H5 132.902
C2 O1 C3 50.237 C2 C3 H5 162.216
C3 C2 H4 162.216
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability