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: PBE1PBE/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 PBE1PBE/6-311+G(3df,2p)
 hartrees
Energy at 0K-153.668281
Energy at 298.15K 
HF Energy-153.668281
Nuclear repulsion energy75.757974
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 PBE1PBE/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 3108 3108 15.86 222.13 0.07 0.13
2 A1 1543 1543 3.20 3.24 0.19 0.32
3 A1 1329 1329 17.05 29.06 0.12 0.22
4 A1 1161 1161 0.00 2.25 0.27 0.43
5 A1 929 929 71.99 7.99 0.69 0.82
6 A2 3185 3185 0.00 108.18 0.75 0.86
7 A2 1173 1173 0.00 1.22 0.75 0.86
8 A2 1056 1056 0.00 0.04 0.75 0.86
9 B1 3200 3200 37.26 20.66 0.75 0.86
10 B1 1182 1182 4.12 3.79 0.75 0.86
11 B1 818 818 0.27 2.70 0.75 0.86
12 B2 3100 3100 33.53 9.56 0.75 0.86
13 B2 1499 1499 0.40 3.38 0.75 0.86
14 B2 1167 1167 0.31 0.26 0.75 0.86
15 B2 903 903 10.67 3.53 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12676.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 12676.4 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 PBE1PBE/6-311+G(3df,2p)
ABC
0.87246 0.74580 0.48017

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/6-311+G(3df,2p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.845
C2 0.000 0.729 -0.368
C3 0.000 -0.729 -0.368
H4 0.920 1.264 -0.586
H5 -0.920 1.264 -0.586
H6 -0.920 -1.264 -0.586
H7 0.920 -1.264 -0.586

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.41441.41442.11902.11902.11902.1190
C21.41441.45791.08611.08612.20582.2058
C31.41441.45792.20582.20581.08611.0861
H42.11901.08612.20581.83913.12632.5282
H52.11901.08612.20581.83912.52823.1263
H62.11902.20581.08613.12632.52821.8391
H72.11902.20581.08612.52823.12631.8391

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 58.978 O1 C2 H4 115.237
O1 C2 H5 115.237 O1 C3 C2 58.978
O1 C3 H6 115.237 O1 C3 H7 115.237
C2 O1 C3 62.045 C2 C3 H6 119.518
C2 C3 H7 119.518 C3 C2 H4 119.518
C3 C2 H5 119.518 H4 C2 H5 115.691
H6 C3 H7 115.691
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/6-311+G(3df,2p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.555      
2 C 0.055      
3 C 0.055      
4 H 0.111      
5 H 0.111      
6 H 0.111      
7 H 0.111      


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 -1.853 1.853
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.358 0.000 0.000
y 0.000 -16.415 0.000
z 0.000 0.000 -20.902
Traceless
 xyz
x 1.301 0.000 0.000
y 0.000 2.714 0.000
z 0.000 0.000 -4.015
Polar
3z2-r2-8.030
x2-y2-0.943
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.826 0.000 0.000
y 0.000 4.695 0.000
z 0.000 0.000 3.787


<r2> (average value of r2) Å2
<r2> 36.235
(<r2>)1/2 6.020