return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for C2H5OO (ethylperoxy radical)

using model chemistry: MP3=FULL/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at MP3=FULL/6-31+G**
 hartrees
Energy at 0K-228.926278
Energy at 298.15K-228.932323
HF Energy-228.255551
Nuclear repulsion energy124.270878
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 MP3=FULL/6-31+G**
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' 3233 3012 17.24      
2 A' 3170 2954 15.46      
3 A' 3144 2929 11.82      
4 A' 1571 1464 3.68      
5 A' 1554 1448 3.14      
6 A' 1482 1380 19.06      
7 A' 1432 1334 8.31      
8 A' 1232 1148 122.69      
9 A' 1184 1103 13.01      
10 A' 1081 1007 14.64      
11 A' 899 837 4.44      
12 A' 524 488 9.19      
13 A' 319 298 1.30      
14 A" 3247 3025 32.16      
15 A" 3227 3006 0.59      
16 A" 1539 1434 6.58      
17 A" 1318 1228 0.33      
18 A" 1201 1119 4.37      
19 A" 831 774 0.25      
20 A" 242 226 0.49      
21 A" 79 74 0.07      

Unscaled Zero Point Vibrational Energy (zpe) 16254.5 cm-1
Scaled (by 0.9316) Zero Point Vibrational Energy (zpe) 15142.7 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 MP3=FULL/6-31+G**
ABC
1.11823 0.14866 0.13801

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3=FULL/6-31+G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.496 0.900 0.000
C2 0.000 0.672 0.000
O3 -0.213 -0.757 0.000
O4 -1.490 -1.054 0.000
H5 1.699 1.969 0.000
H6 1.953 0.462 0.884
H7 1.953 0.462 -0.884
H8 -0.478 1.082 -0.887
H9 -0.478 1.082 0.887

Atom - Atom Distances (Å)
  C1 C2 O3 O4 H5 H6 H7 H8 H9
C11.51372.38143.56941.08751.08731.08732.17202.1720
C21.51371.44522.28052.13752.15382.15381.08761.0876
O32.38141.44521.31093.33012.63792.63792.05912.0591
O43.56942.28051.31094.39453.86423.86422.52492.5249
H51.08752.13753.33014.39451.76561.76562.51252.5125
H61.08732.15382.63793.86421.76561.76803.07062.5086
H71.08732.15382.63793.86421.76561.76802.50863.0706
H82.17201.08762.05912.52492.51253.07062.50861.7736
H92.17201.08762.05912.52492.51252.50863.07061.7736

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 107.164 C1 C2 H8 112.182
C1 C2 H9 112.182 C2 C1 H5 109.425
C2 C1 H6 110.730 C2 C1 H7 110.730
C2 O3 O4 111.586 O3 C2 H8 107.940
O3 C2 H9 107.940 H5 C1 H6 108.556
H5 C1 H7 108.556 H6 C1 H7 108.787
H8 C2 H9 109.238
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability