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/STO-3G

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/STO-3G
 hartrees
Energy at 0K-151.762412
Energy at 298.15K 
HF Energy-151.762412
Nuclear repulsion energy73.373148
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/STO-3G
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 3344 2959 0.18 72.03 0.10 0.17
2 A1 1666 1475 0.17 12.78 0.69 0.82
3 A1 1385 1226 2.01 16.38 0.30 0.46
4 A1 1250 1106 4.89 1.82 0.27 0.42
5 A1 986 873 8.71 7.43 0.74 0.85
6 A2 3478 3078 0.00 51.77 0.75 0.86
7 A2 1221 1080 0.00 6.20 0.75 0.86
8 A2 1065 942 0.00 0.15 0.75 0.86
9 B1 3488 3087 3.93 8.58 0.75 0.86
10 B1 1179 1044 4.95 11.06 0.75 0.86
11 B1 869 769 0.00 3.91 0.75 0.86
12 B2 3332 2949 1.80 5.22 0.75 0.86
13 B2 1621 1435 0.08 5.60 0.75 0.86
14 B2 1198 1061 1.99 0.53 0.75 0.86
15 B2 1058 936 0.20 5.76 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 13569.8 cm-1
Scaled (by 0.885) Zero Point Vibrational Energy (zpe) 12009.3 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/STO-3G
ABC
0.80508 0.71067 0.44687

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/STO-3G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.886
C2 0.000 0.751 -0.379
C3 0.000 -0.751 -0.379
H4 0.927 1.292 -0.634
H5 -0.927 1.292 -0.634
H6 -0.927 -1.292 -0.634
H7 0.927 -1.292 -0.634

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.47061.47062.20002.20002.20002.2000
C21.47061.50121.10401.10402.25802.2580
C31.47061.50122.25802.25801.10401.1040
H42.20001.10402.25801.85503.18122.5845
H52.20001.10402.25801.85502.58453.1812
H62.20002.25801.10403.18122.58451.8550
H72.20002.25801.10402.58453.18121.8550

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 59.310 O1 C2 H4 116.697
O1 C2 H5 116.697 O1 C3 C2 59.310
O1 C3 H6 116.697 O1 C3 H7 116.697
C2 O1 C3 61.381 C2 C3 H6 119.382
C2 C3 H7 119.382 C3 C2 H4 119.382
C3 C2 H5 119.382 H4 C2 H5 114.307
H6 C3 H7 114.307
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.163      
2 C -0.095      
3 C -0.095      
4 H 0.088      
5 H 0.088      
6 H 0.088      
7 H 0.088      


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 -1.268 1.268
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -16.136 0.000 0.000
y 0.000 -15.823 0.000
z 0.000 0.000 -18.629
Traceless
 xyz
x 1.091 0.000 0.000
y 0.000 1.559 0.000
z 0.000 0.000 -2.650
Polar
3z2-r2-5.300
x2-y2-0.313
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.624 0.000 0.000
y 0.000 2.454 0.000
z 0.000 0.000 1.376


<r2> (average value of r2) Å2
<r2> 37.021
(<r2>)1/2 6.084