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: HSEh1PBE/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at HSEh1PBE/6-31G*
 hartrees
Energy at 0K-153.623262
Energy at 298.15K 
HF Energy-153.623262
Nuclear repulsion energy75.514349
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 HSEh1PBE/6-31G*
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 3134 2980 12.10 194.78 0.10 0.17
2 A1 1578 1501 4.42 3.12 0.72 0.84
3 A1 1339 1273 13.25 24.03 0.17 0.29
4 A1 1176 1118 0.15 1.41 0.53 0.69
5 A1 937 891 61.27 11.75 0.74 0.85
6 A2 3208 3051 0.00 107.83 0.75 0.86
7 A2 1191 1132 0.00 4.85 0.75 0.86
8 A2 1054 1003 0.00 0.21 0.75 0.86
9 B1 3223 3065 58.01 15.10 0.75 0.86
10 B1 1186 1127 2.74 15.31 0.75 0.86
11 B1 825 785 0.06 9.08 0.75 0.86
12 B2 3125 2972 38.91 9.76 0.75 0.86
13 B2 1530 1455 0.54 6.92 0.75 0.86
14 B2 1151 1095 2.21 3.62 0.75 0.86
15 B2 909 864 13.66 4.29 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12782.1 cm-1
Scaled (by 0.951) Zero Point Vibrational Energy (zpe) 12155.8 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 HSEh1PBE/6-31G*
ABC
0.86721 0.74091 0.47682

See section I.F.4 to change rotational constant units
Geometric Data calculated at HSEh1PBE/6-31G*

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 0.921 1.270 -0.591
H5 -0.921 1.270 -0.591
H6 -0.921 -1.270 -0.591
H7 0.921 -1.270 -0.591

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.41841.41842.12842.12842.12842.1284
C21.41841.46241.09001.09002.21422.2142
C31.41841.46242.21422.21421.09001.0900
H42.12841.09002.21421.84183.13752.5400
H52.12841.09002.21421.84182.54003.1375
H62.12842.21421.09003.13752.54001.8418
H72.12842.21421.09002.54003.13751.8418

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 58.968 O1 C2 H4 115.480
O1 C2 H5 115.480 O1 C3 C2 58.968
O1 C3 H6 115.480 O1 C3 H7 115.480
C2 O1 C3 62.063 C2 C3 H6 119.623
C2 C3 H7 119.623 C3 C2 H4 119.623
C3 C2 H5 119.623 H4 C2 H5 115.313
H6 C3 H7 115.313
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HSEh1PBE/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.422      
2 C -0.143      
3 C -0.143      
4 H 0.177      
5 H 0.177      
6 H 0.177      
7 H 0.177      


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 -1.938 1.938
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.111 0.000 0.000
y 0.000 -16.237 0.000
z 0.000 0.000 -20.305
Traceless
 xyz
x 1.161 0.000 0.000
y 0.000 2.470 0.000
z 0.000 0.000 -3.631
Polar
3z2-r2-7.262
x2-y2-0.873
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.270 0.000 0.000
y 0.000 4.166 0.000
z 0.000 0.000 2.649


<r2> (average value of r2) Å2
<r2> 36.197
(<r2>)1/2 6.016