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/6-31G**

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/6-31G**
 hartrees
Energy at 0K-152.415943
Energy at 298.15K 
HF Energy-152.415943
Nuclear repulsion energy61.587941
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/6-31G**
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 3432 3432 2.00 84.66 0.19 0.31
2 A1 1873 1873 0.66 54.23 0.21 0.35
3 A1 1115 1115 8.01 6.02 0.42 0.59
4 A1 909 909 47.34 8.13 0.62 0.76
5 A2 641 641 0.00 1.75 0.75 0.86
6 B1 552 552 82.68 0.66 0.75 0.86
7 B2 3357 3357 43.48 16.50 0.75 0.86
8 B2 976 976 5.64 3.77 0.75 0.86
9 B2 107 107 4.53 13.42 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6481.0 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6481.0 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/6-31G**
ABC
1.11703 0.89052 0.49550

See section I.F.4 to change rotational constant units
Geometric Data calculated at wB97X-D/6-31G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.889
C2 0.000 0.632 -0.460
C3 0.000 -0.632 -0.460
H4 0.000 1.651 -0.794
H5 0.000 -1.651 -0.794

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.48981.48982.35772.3577
C21.48981.26461.07232.3079
C31.48981.26462.30791.0723
H42.35771.07232.30793.3026
H52.35772.30791.07233.3026

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.887 O1 C2 H4 133.255
O1 C3 C2 64.887 O1 C3 H5 133.255
C2 O1 C3 50.227 C2 C3 H5 161.859
C3 C2 H4 161.859
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at wB97X-D/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.493      
2 C 0.059      
3 C 0.059      
4 H 0.188      
5 H 0.188      


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 -2.576 2.576
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.010 0.000 0.000
y 0.000 -11.365 0.000
z 0.000 0.000 -18.248
Traceless
 xyz
x -3.203 0.000 0.000
y 0.000 6.764 0.000
z 0.000 0.000 -3.561
Polar
3z2-r2-7.122
x2-y2-6.645
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.536 0.000 0.000
y 0.000 4.355 0.000
z 0.000 0.000 2.803


<r2> (average value of r2) Å2
<r2> 30.288
(<r2>)1/2 5.503