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: TPSSh/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 TPSSh/3-21G*
 hartrees
Energy at 0K-152.938311
Energy at 298.15K 
HF Energy-152.938311
Nuclear repulsion energy72.914277
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 TPSSh/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 3127 3019 4.75 180.46 0.10 0.18
2 A1 1567 1513 0.13 6.78 0.73 0.84
3 A1 1218 1176 6.92 18.83 0.13 0.23
4 A1 1125 1086 8.56 5.66 0.38 0.55
5 A1 836 807 25.98 10.66 0.74 0.85
6 A2 3201 3092 0.00 103.59 0.75 0.86
7 A2 1195 1154 0.00 6.32 0.75 0.86
8 A2 986 952 0.00 0.01 0.75 0.86
9 B1 3222 3112 50.78 13.99 0.75 0.86
10 B1 1101 1063 0.41 19.85 0.75 0.86
11 B1 834 805 0.06 11.65 0.75 0.86
12 B2 3116 3009 29.26 8.31 0.75 0.86
13 B2 1548 1494 0.25 6.18 0.75 0.86
14 B2 1115 1077 15.44 3.39 0.75 0.86
15 B2 783 756 6.25 7.21 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12485.4 cm-1
Scaled (by 0.9657) Zero Point Vibrational Energy (zpe) 12057.2 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 TPSSh/3-21G*
ABC
0.76819 0.72367 0.43928

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.911
C2 0.000 0.746 -0.398
C3 0.000 -0.746 -0.398
H4 0.923 1.272 -0.626
H5 -0.923 1.272 -0.626
H6 -0.923 -1.272 -0.626
H7 0.923 -1.272 -0.626

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.50631.50632.19822.19822.19822.1982
C21.50631.49111.08651.08652.23022.2302
C31.50631.49112.23022.23021.08651.0865
H42.19821.08652.23021.84533.14282.5440
H52.19821.08652.23021.84532.54403.1428
H62.19822.23021.08653.14282.54401.8453
H72.19822.23021.08652.54403.14281.8453

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 60.334 O1 C2 H4 114.982
O1 C2 H5 114.982 O1 C3 C2 60.334
O1 C3 H6 114.982 O1 C3 H7 114.982
C2 O1 C3 59.332 C2 C3 H6 118.982
C2 C3 H7 118.982 C3 C2 H4 118.982
C3 C2 H5 118.982 H4 C2 H5 116.245
H6 C3 H7 116.245
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at TPSSh/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.421      
2 C -0.238      
3 C -0.238      
4 H 0.224      
5 H 0.224      
6 H 0.224      
7 H 0.224      


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 -2.290 2.290
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.975 0.000 0.000
y 0.000 4.094 0.000
z 0.000 0.000 2.546


<r2> (average value of r2) Å2
<r2> 37.932
(<r2>)1/2 6.159