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: B3PW91/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B3PW91/6-311G**
 hartrees
Energy at 0K-152.448806
Energy at 298.15K 
HF Energy-152.448806
Nuclear repulsion energy61.562249
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 B3PW91/6-311G**
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 3409 3283 2.07 80.79 0.21 0.35
2 A1 1837 1769 0.93 61.45 0.19 0.32
3 A1 1084 1044 7.97 6.61 0.52 0.68
4 A1 900 867 56.25 7.07 0.64 0.78
5 A2 645 621 0.00 4.03 0.75 0.86
6 B1 547 526 91.67 0.51 0.75 0.86
7 B2 3333 3210 48.41 16.28 0.75 0.86
8 B2 960 924 5.96 2.48 0.75 0.86
9 B2 170i 164i 6.63 14.74 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6271.4 cm-1
Scaled (by 0.9631) Zero Point Vibrational Energy (zpe) 6040.0 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 B3PW91/6-311G**
ABC
1.11910 0.88732 0.49491

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-311G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.890
C2 0.000 0.632 -0.462
C3 0.000 -0.632 -0.462
H4 0.000 1.651 -0.792
H5 0.000 -1.651 -0.792

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.49221.49222.35662.3566
C21.49221.26301.07132.3060
C31.49221.26302.30601.0713
H42.35661.07132.30603.3015
H52.35662.30601.07133.3015

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.963 O1 C2 H4 132.971
O1 C3 C2 64.963 O1 C3 H5 132.971
C2 O1 C3 50.074 C2 C3 H5 162.066
C3 C2 H4 162.066
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.363      
2 C 0.052      
3 C 0.052      
4 H 0.130      
5 H 0.130      


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 -2.488 2.488
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.341 0.000 0.000
y 0.000 -11.510 0.000
z 0.000 0.000 -18.515
Traceless
 xyz
x -3.329 0.000 0.000
y 0.000 6.918 0.000
z 0.000 0.000 -3.589
Polar
3z2-r2-7.178
x2-y2-6.831
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.835 0.000 0.000
y 0.000 4.442 0.000
z 0.000 0.000 2.987


<r2> (average value of r2) Å2
<r2> 30.457
(<r2>)1/2 5.519