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: wB97X-D/LANL2DZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at wB97X-D/LANL2DZ
 hartrees
Energy at 0K-152.387358
Energy at 298.15K 
HF Energy-152.387358
Nuclear repulsion energy59.684593
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 wB97X-D/LANL2DZ
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 3467 3467 1.89 88.43 0.16 0.28
2 A1 1802 1802 1.51 65.64 0.20 0.33
3 A1 1006 1006 0.07 6.25 0.42 0.59
4 A1 868 868 51.73 10.79 0.49 0.65
5 A2 735 735 0.00 8.79 0.75 0.86
6 B1 621 621 145.62 0.10 0.75 0.86
7 B2 3391 3391 51.59 20.84 0.75 0.86
8 B2 963 963 10.60 1.54 0.75 0.86
9 B2 223 223 3.04 18.91 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6538.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6538.3 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 wB97X-D/LANL2DZ
ABC
1.09352 0.80053 0.46218

See section I.F.4 to change rotational constant units
Geometric Data calculated at wB97X-D/LANL2DZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.937
C2 0.000 0.642 -0.486
C3 0.000 -0.642 -0.486
H4 0.000 1.656 -0.832
H5 0.000 -1.656 -0.832

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.56161.56162.42312.4231
C21.56161.28401.07092.3234
C31.56161.28402.32341.0709
H42.42311.07092.32343.3111
H52.42312.32341.07093.3111

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 65.727 O1 C2 H4 133.106
O1 C3 C2 65.727 O1 C3 H5 133.106
C2 O1 C3 48.547 C2 C3 H5 161.168
C3 C2 H4 161.168
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at wB97X-D/LANL2DZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.398      
2 C -0.069      
3 C -0.069      
4 H 0.268      
5 H 0.268      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -3.064 3.064
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.582 0.000 0.000
y 0.000 -11.427 0.000
z 0.000 0.000 -18.894
Traceless
 xyz
x -3.422 0.000 0.000
y 0.000 7.311 0.000
z 0.000 0.000 -3.889
Polar
3z2-r2-7.779
x2-y2-7.156
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.419 0.000 0.000
y 0.000 4.337 0.000
z 0.000 0.000 3.160


<r2> (average value of r2) Å2
<r2> 31.859
(<r2>)1/2 5.644