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 C2H4O (Ethylene oxide)

using model chemistry: B3PW91/6-311+G(3df,2p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B3PW91/6-311+G(3df,2p)
 hartrees
Energy at 0K-153.788681
Energy at 298.15K 
HF Energy-153.788681
Nuclear repulsion energy75.604893
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 B3PW91/6-311+G(3df,2p)
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 3095 2963 16.41 221.77 0.07 0.13
2 A1 1538 1472 2.86 2.94 0.26 0.41
3 A1 1317 1261 16.57 28.89 0.12 0.21
4 A1 1155 1105 0.00 2.58 0.22 0.36
5 A1 915 876 70.88 8.05 0.71 0.83
6 A2 3170 3035 0.00 108.94 0.75 0.86
7 A2 1171 1121 0.00 1.26 0.75 0.86
8 A2 1052 1007 0.00 0.04 0.75 0.86
9 B1 3186 3050 39.21 20.86 0.75 0.86
10 B1 1176 1126 3.94 3.86 0.75 0.86
11 B1 818 783 0.27 2.76 0.75 0.86
12 B2 3087 2955 35.21 9.80 0.75 0.86
13 B2 1499 1435 0.29 3.44 0.75 0.86
14 B2 1163 1114 0.32 0.28 0.75 0.86
15 B2 882 844 10.56 3.55 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12610.7 cm-1
Scaled (by 0.9573) Zero Point Vibrational Energy (zpe) 12072.2 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 B3PW91/6-311+G(3df,2p)
ABC
0.86725 0.74422 0.47784

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-311+G(3df,2p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.848
C2 0.000 0.730 -0.369
C3 0.000 -0.730 -0.369
H4 0.919 1.266 -0.587
H5 -0.919 1.266 -0.587
H6 -0.919 -1.266 -0.587
H7 0.919 -1.266 -0.587

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.41901.41902.12282.12282.12282.1228
C21.41901.45991.08601.08602.20802.2080
C31.41901.45992.20802.20801.08601.0860
H42.12281.08602.20801.83823.12852.5315
H52.12281.08602.20801.83822.53153.1285
H62.12282.20801.08603.12852.53151.8382
H72.12282.20801.08602.53153.12851.8382

picture of Ethylene oxide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 59.044 O1 C2 H4 115.217
O1 C2 H5 115.217 O1 C3 C2 59.044
O1 C3 H6 115.217 O1 C3 H7 115.217
C2 O1 C3 61.913 C2 C3 H6 119.564
C2 C3 H7 119.564 C3 C2 H4 119.564
C3 C2 H5 119.564 H4 C2 H5 115.621
H6 C3 H7 115.621
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-311+G(3df,2p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.538      
2 C 0.029      
3 C 0.029      
4 H 0.120      
5 H 0.120      
6 H 0.120      
7 H 0.120      


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 -1.870 1.870
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.335 0.000 0.000
y 0.000 -16.369 0.000
z 0.000 0.000 -20.863
Traceless
 xyz
x 1.281 0.000 0.000
y 0.000 2.730 0.000
z 0.000 0.000 -4.011
Polar
3z2-r2-8.022
x2-y2-0.966
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.832 0.000 0.000
y 0.000 4.707 0.000
z 0.000 0.000 3.811


<r2> (average value of r2) Å2
<r2> 36.306
(<r2>)1/2 6.025