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All results from a given calculation for C2H2O (Oxirene)

using model chemistry: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-152.122789
Energy at 298.15K 
HF Energy-151.598940
Nuclear repulsion energy61.219180
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 MP2/6-31G(2df,p)
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 3465 3273 2.66 91.94 0.20 0.33
2 A1 1783 1684 1.80 27.51 0.17 0.29
3 A1 1104 1043 2.72 4.79 0.20 0.33
4 A1 894 844 43.54 6.87 0.46 0.63
5 A2 543 513 0.00 0.35 0.75 0.86
6 B1 530 500 72.52 0.48 0.75 0.86
7 B2 3395 3206 54.76 15.57 0.75 0.86
8 B2 948 895 6.66 3.20 0.75 0.86
9 B2 123 116 0.89 11.69 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6392.0 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 6037.3 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 MP2/6-31G(2df,p)
ABC
1.10668 0.87693 0.48925

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.896
C2 0.000 0.636 -0.465
C3 0.000 -0.636 -0.465
H4 0.000 1.654 -0.793
H5 0.000 -1.654 -0.793

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.50191.50192.36352.3635
C21.50191.27281.06902.3135
C31.50191.27282.31351.0690
H42.36351.06902.31353.3075
H52.36352.31351.06903.3075

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.930 O1 C2 H4 132.945
O1 C3 C2 64.930 O1 C3 H5 132.945
C2 O1 C3 50.140 C2 C3 H5 162.125
C3 C2 H4 162.125
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability