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: mPW1PW91/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at mPW1PW91/6-311G**
 hartrees
Energy at 0K-153.789237
Energy at 298.15K 
HF Energy-153.789237
Nuclear repulsion energy75.619983
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 mPW1PW91/6-311G**
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 3113 2979 12.54 216.39 0.09 0.17
2 A1 1552 1485 3.84 1.55 0.59 0.74
3 A1 1329 1272 16.16 25.84 0.16 0.28
4 A1 1158 1108 0.04 0.76 0.60 0.75
5 A1 924 884 70.36 10.85 0.73 0.84
6 A2 3190 3051 0.00 113.64 0.75 0.86
7 A2 1175 1124 0.00 2.72 0.75 0.86
8 A2 1051 1006 0.00 0.10 0.75 0.86
9 B1 3205 3066 56.89 17.24 0.75 0.86
10 B1 1181 1130 4.22 10.55 0.75 0.86
11 B1 823 787 0.03 5.94 0.75 0.86
12 B2 3104 2970 40.84 9.89 0.75 0.86
13 B2 1507 1442 0.01 6.04 0.75 0.86
14 B2 1147 1097 2.48 1.89 0.75 0.86
15 B2 892 853 12.10 3.94 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12674.9 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 12126.1 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 mPW1PW91/6-311G**
ABC
0.86900 0.74331 0.47803

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-311G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.847
C2 0.000 0.731 -0.368
C3 0.000 -0.731 -0.368
H4 0.919 1.266 -0.590
H5 -0.919 1.266 -0.590
H6 -0.919 -1.266 -0.590
H7 0.919 -1.266 -0.590

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.41731.41732.12412.12412.12412.1241
C21.41731.46141.08661.08662.20912.2091
C31.41731.46142.20912.20911.08661.0866
H42.12411.08662.20911.83853.12862.5314
H52.12411.08662.20911.83852.53143.1286
H62.12412.20911.08663.12862.53141.8385
H72.12412.20911.08662.53143.12861.8385

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 58.965 O1 C2 H4 115.425
O1 C2 H5 115.425 O1 C3 C2 58.965
O1 C3 H6 115.425 O1 C3 H7 115.425
C2 O1 C3 62.070 C2 C3 H6 119.494
C2 C3 H7 119.494 C3 C2 H4 119.494
C3 C2 H5 119.494 H4 C2 H5 115.551
H6 C3 H7 115.551
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.307      
2 C -0.103      
3 C -0.103      
4 H 0.128      
5 H 0.128      
6 H 0.128      
7 H 0.128      


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 -1.941 1.941
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.133 0.000 0.000
y 0.000 -16.320 0.000
z 0.000 0.000 -20.503
Traceless
 xyz
x 1.279 0.000 0.000
y 0.000 2.498 0.000
z 0.000 0.000 -3.776
Polar
3z2-r2-7.553
x2-y2-0.813
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.363 0.000 0.000
y 0.000 4.354 0.000
z 0.000 0.000 2.941


<r2> (average value of r2) Å2
<r2> 36.180
(<r2>)1/2 6.015