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: B3LYPultrafine/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B3LYPultrafine/TZVP
 hartrees
Energy at 0K-152.529508
Energy at 298.15K 
HF Energy-152.529508
Nuclear repulsion energy61.384088
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 B3LYPultrafine/TZVP
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 3400 3276 2.75 84.48 0.19 0.32
2 A1 1836 1769 2.45 71.46 0.14 0.25
3 A1 1061 1022 5.84 5.90 0.51 0.68
4 A1 884 852 60.66 9.49 0.62 0.76
5 A2 650 627 0.00 4.20 0.75 0.86
6 B1 554 534 95.72 0.37 0.75 0.86
7 B2 3328 3206 54.10 17.55 0.75 0.86
8 B2 974 938 6.84 2.13 0.75 0.86
9 B2 165i 159i 4.82 16.29 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6260.8 cm-1
Scaled (by 0.9634) Zero Point Vibrational Energy (zpe) 6031.7 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 B3LYPultrafine/TZVP
ABC
1.12382 0.87321 0.49139

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYPultrafine/TZVP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.898
C2 0.000 0.630 -0.465
C3 0.000 -0.630 -0.465
H4 0.000 1.647 -0.800
H5 0.000 -1.647 -0.800

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.50131.50132.36492.3649
C21.50131.26061.07022.3015
C31.50131.26062.30151.0702
H42.36491.07022.30153.2936
H52.36492.30151.07023.2936

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 65.177 O1 C2 H4 133.045
O1 C3 C2 65.177 O1 C3 H5 133.045
C2 O1 C3 49.646 C2 C3 H5 161.779
C3 C2 H4 161.779
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYPultrafine/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.345      
2 C -0.002      
3 C -0.002      
4 H 0.175      
5 H 0.175      


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 -2.615 2.615
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.733 0.000 0.000
y 0.000 -11.833 0.000
z 0.000 0.000 -19.026
Traceless
 xyz
x -3.304 0.000 0.000
y 0.000 7.047 0.000
z 0.000 0.000 -3.743
Polar
3z2-r2-7.485
x2-y2-6.900
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.252 0.000 0.000
y 0.000 4.632 0.000
z 0.000 0.000 3.345


<r2> (average value of r2) Å2
<r2> 30.835
(<r2>)1/2 5.553