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: CCSD(T)=FULL/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 CCSD(T)=FULL/6-31G*
 hartrees
Energy at 0K-228.905877
Energy at 298.15K-228.911847
HF Energy-228.240072
Nuclear repulsion energy123.223432
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/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' 3149 3057        
2 A' 3085 2994        
3 A' 3069 2979        
4 A' 1551 1506        
5 A' 1540 1495        
6 A' 1462 1419        
7 A' 1402 1361        
8 A' 1172 1138        
9 A' 1151 1117        
10 A' 1058 1027        
11 A' 873 847        
12 A' 509 494        
13 A' 308 299        
14 A" 3161 3069        
15 A" 3137 3045        
16 A" 1529 1484        
17 A" 1304 1266        
18 A" 1186 1151        
19 A" 822 797        
20 A" 225 218        
21 A" 89 86        

Unscaled Zero Point Vibrational Energy (zpe) 15890.4 cm-1
Scaled (by 0.9707) Zero Point Vibrational Energy (zpe) 15424.9 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/6-31G*
ABC
1.09760 0.14682 0.13622

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)=FULL/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.496 0.914 0.000
C2 0.000 0.676 0.000
O3 -0.196 -0.772 0.000
O4 -1.505 -1.057 0.000
H5 1.699 1.992 0.000
H6 1.959 0.473 0.891
H7 1.959 0.473 -0.891
H8 -0.494 1.074 -0.894
H9 -0.494 1.074 0.894

Atom - Atom Distances (Å)
  C1 C2 O3 O4 H5 H6 H7 H8 H9
C11.51532.38873.59051.09701.09611.09612.18782.1878
C21.51531.46072.29482.14942.16142.16141.09631.0963
O32.38871.46071.33963.35122.64332.64332.07262.0726
O43.59052.29481.33964.42283.89013.89012.52222.5222
H51.09702.14943.35124.42281.77981.77982.54002.5400
H61.09612.16142.64333.89011.77981.78143.09242.5256
H71.09612.16142.64333.89011.77981.78142.52563.0924
H82.18781.09632.07262.52222.54003.09242.52561.7875
H92.18781.09632.07262.52222.54002.52563.09241.7875

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 106.755 C1 C2 H8 112.826
C1 C2 H9 112.826 C2 C1 H5 109.699
C2 C1 H6 110.701 C2 C1 H7 110.701
C2 O3 O4 109.987 O3 C2 H8 107.445
O3 C2 H9 107.445 H5 C1 H6 108.490
H5 C1 H7 108.490 H6 C1 H7 108.698
H8 C2 H9 109.233
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability