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: CCSD(T)=FULL/daug-cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CCSD(T)=FULL/daug-cc-pVTZ
 hartrees
Energy at 0K-153.613201
Energy at 298.15K 
HF Energy-152.928853
Nuclear repulsion energy75.368794
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 CCSD(T)=FULL/daug-cc-pVTZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3125 3125        
2 A1 1552 1552        
3 A1 1306 1306        
4 A1 1154 1154        
5 A1 902 902        
6 A2 3192 3192        
7 A2 1179 1179        
8 A2 1052 1052        
9 B1 3208 3208        
10 B1 1178 1178        
11 B1 818 818        
12 B2 3116 3116        
13 B2 1513 1513        
14 B2 1163 1163        
15 B2 845 845        

Unscaled Zero Point Vibrational Energy (zpe) 12651.9 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 12651.9 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 CCSD(T)=FULL/daug-cc-pVTZ
ABC
0.85591 0.74399 0.47425

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)=FULL/daug-cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.854
C2 0.000 0.732 -0.374
C3 0.000 -0.732 -0.374
H4 0.919 1.261 -0.588
H5 -0.919 1.261 -0.588
H6 -0.919 -1.261 -0.588
H7 0.919 -1.261 -0.588

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.42921.42922.12472.12472.12472.1247
C21.42921.46301.08211.08212.20482.2048
C31.42921.46302.20482.20481.08211.0821
H42.12471.08212.20481.83793.12092.5223
H52.12471.08212.20481.83792.52233.1209
H62.12472.20481.08213.12092.52231.8379
H72.12472.20481.08212.52233.12091.8379

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 59.215 O1 C2 H4 114.874
O1 C2 H5 114.874 O1 C3 C2 59.215
O1 C3 H6 114.874 O1 C3 H7 114.874
C2 O1 C3 61.571 C2 C3 H6 119.307
C2 C3 H7 119.307 C3 C2 H4 119.307
C3 C2 H5 119.307 H4 C2 H5 116.257
H6 C3 H7 116.257
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability