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/aug-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/aug-cc-pVTZ
 hartrees
Energy at 0K-153.609962
Energy at 298.15K 
HF Energy-152.928682
Nuclear repulsion energy75.382994
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/aug-cc-pVTZ
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 3131 3017        
2 A1 1555 1498        
3 A1 1306 1258        
4 A1 1156 1114        
5 A1 902 870        
6 A2 3193 3077        
7 A2 1176 1133        
8 A2 1049 1011        
9 B1 3208 3092        
10 B1 1180 1137        
11 B1 815 786        
12 B2 3119 3006        
13 B2 1514 1459        
14 B2 1163 1121        
15 B2 846 815        

Unscaled Zero Point Vibrational Energy (zpe) 12656.1 cm-1
Scaled (by 0.9637) Zero Point Vibrational Energy (zpe) 12196.7 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/aug-cc-pVTZ
ABC
0.85622 0.74426 0.47438

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)=FULL/aug-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 0.731 -0.373
C3 0.000 -0.731 -0.373
H4 0.919 1.261 -0.589
H5 -0.919 1.261 -0.589
H6 -0.919 -1.261 -0.589
H7 0.919 -1.261 -0.589

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.42891.42892.12472.12472.12472.1247
C21.42891.46301.08171.08172.20432.2043
C31.42891.46302.20432.20431.08171.0817
H42.12471.08172.20431.83713.11962.5213
H52.12471.08172.20431.83712.52133.1196
H62.12472.20431.08173.11962.52131.8371
H72.12472.20431.08172.52133.11961.8371

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 59.208 O1 C2 H4 114.921
O1 C2 H5 114.921 O1 C3 C2 59.208
O1 C3 H6 114.921 O1 C3 H7 114.921
C2 O1 C3 61.585 C2 C3 H6 119.289
C2 C3 H7 119.289 C3 C2 H4 119.289
C3 C2 H5 119.289 H4 C2 H5 116.241
H6 C3 H7 116.241
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability