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: M06-2X/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at M06-2X/3-21G*
 hartrees
Energy at 0K-152.852474
Energy at 298.15K 
HF Energy-152.852474
Nuclear repulsion energy73.503123
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 M06-2X/3-21G*
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 3189 3020 2.01 156.82 0.10 0.18
2 A1 1578 1495 0.00 5.24 0.74 0.85
3 A1 1255 1189 7.95 21.62 0.15 0.26
4 A1 1159 1098 9.13 4.03 0.35 0.52
5 A1 865 819 29.69 11.29 0.75 0.86
6 A2 3268 3095 0.00 83.88 0.75 0.86
7 A2 1201 1137 0.00 6.38 0.75 0.86
8 A2 1015 961 0.00 0.01 0.75 0.86
9 B1 3285 3111 25.32 10.47 0.75 0.86
10 B1 1136 1076 1.63 18.72 0.75 0.86
11 B1 847 803 0.00 9.58 0.75 0.86
12 B2 3179 3011 13.09 6.33 0.75 0.86
13 B2 1553 1471 0.01 5.18 0.75 0.86
14 B2 1152 1091 13.12 2.29 0.75 0.86
15 B2 860 815 3.92 9.33 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12770.9 cm-1
Scaled (by 0.9472) Zero Point Vibrational Energy (zpe) 12096.6 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 M06-2X/3-21G*
ABC
0.79177 0.72555 0.44725

See section I.F.4 to change rotational constant units
Geometric Data calculated at M06-2X/3-21G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.895
C2 0.000 0.745 -0.391
C3 0.000 -0.745 -0.391
H4 0.921 1.269 -0.618
H5 -0.921 1.269 -0.618
H6 -0.921 -1.269 -0.618
H7 0.921 -1.269 -0.618

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.48581.48582.17872.17872.17872.1787
C21.48581.49041.08331.08332.22612.2261
C31.48581.49042.22612.22611.08331.0833
H42.17871.08332.22611.84133.13512.5375
H52.17871.08332.22611.84132.53753.1351
H62.17872.22611.08333.13512.53751.8413
H72.17872.22611.08332.53753.13511.8413

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 59.897 O1 C2 H4 115.101
O1 C2 H5 115.101 O1 C3 C2 59.897
O1 C3 H6 115.101 O1 C3 H7 115.101
C2 O1 C3 60.205 C2 C3 H6 118.901
C2 C3 H7 118.901 C3 C2 H4 118.901
C3 C2 H5 118.901 H4 C2 H5 116.393
H6 C3 H7 116.393
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at M06-2X/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.454      
2 C -0.217      
3 C -0.217      
4 H 0.222      
5 H 0.222      
6 H 0.222      
7 H 0.222      


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 -2.420 2.420
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.200 0.000 0.000
y 0.000 -16.295 0.000
z 0.000 0.000 -20.937
Traceless
 xyz
x 1.416 0.000 0.000
y 0.000 2.774 0.000
z 0.000 0.000 -4.190
Polar
3z2-r2-8.379
x2-y2-0.905
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.884 0.000 0.000
y 0.000 3.997 0.000
z 0.000 0.000 2.416


<r2> (average value of r2) Å2
<r2> 37.591
(<r2>)1/2 6.131