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 C2H5OO (ethylperoxy radical)

using model chemistry: MP2/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at MP2/6-31G*
 hartrees
Energy at 0K-228.829607
Energy at 298.15K-228.835615
HF Energy-228.241465
Nuclear repulsion energy124.050970
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 MP2/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3216 3033 11.06      
2 A' 3144 2965 12.37      
3 A' 3124 2946 7.13      
4 A' 1571 1482 3.81      
5 A' 1561 1472 2.71      
6 A' 1478 1394 16.58      
7 A' 1423 1341 4.25      
8 A' 1274 1201 132.89      
9 A' 1180 1112 9.44      
10 A' 1071 1010 14.83      
11 A' 882 832 3.78      
12 A' 518 489 11.05      
13 A' 316 298 1.25      
14 A" 3229 3045 22.91      
15 A" 3208 3025 3.51      
16 A" 1550 1461 6.92      
17 A" 1314 1239 0.00      
18 A" 1195 1127 4.51      
19 A" 831 784 1.11      
20 A" 245 231 0.44      
21 A" 72 68 0.15      

Unscaled Zero Point Vibrational Energy (zpe) 16200.2 cm-1
Scaled (by 0.943) Zero Point Vibrational Energy (zpe) 15276.8 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 MP2/6-31G*
ABC
1.10479 0.14861 0.13783

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.494 0.892 0.000
C2 0.000 0.678 0.000
O3 -0.207 -0.767 0.000
O4 -1.492 -1.037 0.000
H5 1.708 1.964 0.000
H6 1.948 0.447 0.888
H7 1.948 0.447 -0.888
H8 -0.486 1.081 -0.892
H9 -0.486 1.081 0.892

Atom - Atom Distances (Å)
  C1 C2 O3 O4 H5 H6 H7 H8 H9
C11.50912.37633.55491.09301.09181.09182.17912.1791
C21.50911.45992.27322.13762.15302.15301.09221.0922
O32.37631.45991.31293.33552.62802.62802.07072.0707
O43.55492.27321.31294.38673.85023.85022.50872.5087
H51.09302.13763.33554.38671.77381.77382.52672.5267
H61.09182.15302.62803.85021.77381.77523.08032.5146
H71.09182.15302.62803.85021.77381.77522.51463.0803
H82.17911.09222.07072.50872.52673.08032.51461.7831
H92.17911.09222.07072.50872.52672.51463.08031.7831

picture of ethylperoxy radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 106.319 C1 C2 H8 112.810
C1 C2 H9 112.810 C2 C1 H5 109.435
C2 C1 H6 110.721 C2 C1 H7 110.721
C2 O3 O4 110.017 O3 C2 H8 107.586
O3 C2 H9 107.586 H5 C1 H6 108.567
H5 C1 H7 108.567 H6 C1 H7 108.772
H8 C2 H9 109.420
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability